155117256 has 64 divisors (see below), whose sum is σ = 446090880. Its totient is φ = 44029440.

The previous prime is 155117243. The next prime is 155117269. The reversal of 155117256 is 652711551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155117243) and next prime (155117269).

It is a super-2 number, since 2×155117256² = 48122726217939072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23436 + ... + 29316.

It is an arithmetic number, because the mean of its divisors is an integer number (6970170).

Almost surely, 2^155117256 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 155117256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223045440).

155117256 is an abundant number, since it is smaller than the sum of its proper divisors (290973624).

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

155117256 is a wasteful number, since it uses less digits than its factorization.

155117256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6054 (or 6050 counting only the distinct ones).

The product of its digits is 10500, while the sum is 33.

The square root of 155117256 is about 12454.6078220071. The cubic root of 155117256 is about 537.3039556184.

The spelling of 155117256 in words is "one hundred fifty-five million, one hundred seventeen thousand, two hundred fifty-six".