1201371520 has 128 divisors (see below), whose sum is σ = 3121689600. Its totient is φ = 440432640.

The previous prime is 1201371491. The next prime is 1201371527. The reversal of 1201371520 is 251731021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1201371520² = 2886587058134220800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201371491 and 1201371500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201371527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375367 + ... + 378553.

It is an arithmetic number, because the mean of its divisors is an integer number (24388200).

Almost surely, 2^1201371520 is an apocalyptic number.

1201371520 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 1201371520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560844800).

1201371520 is an abundant number, since it is smaller than the sum of its proper divisors (1920318080).

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

1201371520 is a wasteful number, since it uses less digits than its factorization.

1201371520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3256 (or 3244 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1201371520 is about 34660.8066842075. The cubic root of 1201371520 is about 1063.0632643421.

The spelling of 1201371520 in words is "one billion, two hundred one million, three hundred seventy-one thousand, five hundred twenty".