155631056 has 60 divisors (see below), whose sum is σ = 371430468. Its totient is φ = 62770176.

The previous prime is 155630983. The next prime is 155631079. The reversal of 155631056 is 650136551.

155631056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 127328656 + 28302400 = 11284^2 + 5320^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7490 + ... + 19166.

Almost surely, 2^155631056 is an apocalyptic number.

155631056 is a gapful number since it is divisible by the number (16) 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 155631056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185715234).

155631056 is an abundant number, since it is smaller than the sum of its proper divisors (215799412).

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

155631056 is a wasteful number, since it uses less digits than its factorization.

155631056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11716 (or 11703 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 155631056 is about 12475.2176734516. The cubic root of 155631056 is about 537.8965450157.

The spelling of 155631056 in words is "one hundred fifty-five million, six hundred thirty-one thousand, fifty-six".