1156155520 has 128 divisors (see below), whose sum is σ = 3015936000. Its totient is φ = 421244928.

The previous prime is 1156155503. The next prime is 1156155521. The reversal of 1156155520 is 255516511.

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

It is not an unprimeable number, because it can be changed into a prime (1156155521) 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, 656401 + ... + 658159.

It is an arithmetic number, because the mean of its divisors is an integer number (23562000).

Almost surely, 2^1156155520 is an apocalyptic number.

1156155520 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 1156155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1507968000).

1156155520 is an abundant number, since it is smaller than the sum of its proper divisors (1859780480).

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

1156155520 is a wasteful number, since it uses less digits than its factorization.

1156155520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1858 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

The square root of 1156155520 is about 34002.2869819076. The cubic root of 1156155520 is about 1049.5555246498. Note that the first 4 decimals are identical.

It can be divided in two parts, 11561 and 55520, that added together give a square (67081 = 259²).

The spelling of 1156155520 in words is "one billion, one hundred fifty-six million, one hundred fifty-five thousand, five hundred twenty".