120161556 has 72 divisors (see below), whose sum is σ = 317195424. Its totient is φ = 39774240.

The previous prime is 120161527. The next prime is 120161581. The reversal of 120161556 is 655161021.

It is a happy number.

It is a super-2 number, since 2×120161556² = 28877599080682272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175591 + ... + 176273.

It is an arithmetic number, because the mean of its divisors is an integer number (4405492).

Almost surely, 2^120161556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 120161556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158597712).

120161556 is an abundant number, since it is smaller than the sum of its proper divisors (197033868).

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

120161556 is a wasteful number, since it uses less digits than its factorization.

120161556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 120161556 is about 10961.8226586640. The cubic root of 120161556 is about 493.4636663599.

The spelling of 120161556 in words is "one hundred twenty million, one hundred sixty-one thousand, five hundred fifty-six".