156121556 has 12 divisors (see below), whose sum is σ = 287592480. Its totient is φ = 73952280.

The previous prime is 156121543. The next prime is 156121571. The reversal of 156121556 is 655121651.

156121556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×156121556² = 48747880495722272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027040 + ... + 1027191.

It is an arithmetic number, because the mean of its divisors is an integer number (23966040).

Almost surely, 2^156121556 is an apocalyptic number.

It is an amenable number.

156121556 is a deficient number, since it is larger than the sum of its proper divisors (131470924).

156121556 is a wasteful number, since it uses less digits than its factorization.

156121556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054254 (or 2054252 counting only the distinct ones).

The product of its digits is 9000, while the sum is 32.

The square root of 156121556 is about 12494.8611837027. The cubic root of 156121556 is about 538.4610458038.

The spelling of 156121556 in words is "one hundred fifty-six million, one hundred twenty-one thousand, five hundred fifty-six".