161501256 has 96 divisors (see below), whose sum is σ = 521892000. Its totient is φ = 46140192.

The previous prime is 161501243. The next prime is 161501279. The reversal of 161501256 is 652105161.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2955 + ... + 18213.

It is an arithmetic number, because the mean of its divisors is an integer number (5436375).

Almost surely, 2^161501256 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 161501256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260946000).

161501256 is an abundant number, since it is smaller than the sum of its proper divisors (360390744).

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

161501256 is a wasteful number, since it uses less digits than its factorization.

161501256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15288 (or 15271 counting only the distinct ones).

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

The square root of 161501256 is about 12708.3144437018. The cubic root of 161501256 is about 544.5761719055.

The spelling of 161501256 in words is "one hundred sixty-one million, five hundred one thousand, two hundred fifty-six".