1161856520 has 128 divisors (see below), whose sum is σ = 2914531200. Its totient is φ = 416782080.

The previous prime is 1161856511. The next prime is 1161856559. The reversal of 1161856520 is 256581611.

It is a happy number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7400282 + ... + 7400438.

It is an arithmetic number, because the mean of its divisors is an integer number (22769775).

Almost surely, 2^1161856520 is an apocalyptic number.

1161856520 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 1161856520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1457265600).

1161856520 is an abundant number, since it is smaller than the sum of its proper divisors (1752674680).

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

1161856520 is a wasteful number, since it uses less digits than its factorization.

1161856520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 1161856520 is about 34086.0164877036. The cubic root of 1161856520 is about 1051.2778154361.

The spelling of 1161856520 in words is "one billion, one hundred sixty-one million, eight hundred fifty-six thousand, five hundred twenty".