1201115520 has 512 divisors, whose sum is σ = 4758912000. Its totient is φ = 283852800.

The previous prime is 1201115519. The next prime is 1201115527. The reversal of 1201115520 is 255111021.

1201115520 is a `hidden beast` number, since 1 + 2 + 0 + 111 + 552 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1201115493 and 1201115502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201115527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13495636 + ... + 13495724.

It is an arithmetic number, because the mean of its divisors is an integer number (9294750).

Almost surely, 2^1201115520 is an apocalyptic number.

1201115520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201115520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2379456000).

1201115520 is an abundant number, since it is smaller than the sum of its proper divisors (3557796480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201115520 is a wasteful number, since it uses less digits than its factorization.

1201115520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1201115520 is about 34657.1135555170. The cubic root of 1201115520 is about 1062.9877496702.

Adding to 1201115520 its reverse (255111021), we get a palindrome (1456226541).

The spelling of 1201115520 in words is "one billion, two hundred one million, one hundred fifteen thousand, five hundred twenty".