321161256 has 96 divisors (see below), whose sum is σ = 986076000. Its totient is φ = 93612672.

The previous prime is 321161251. The next prime is 321161257. The reversal of 321161256 is 652161123.

321161256 is a `hidden beast` number, since 32 + 11 + 612 + 5 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (321161251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8755 + ... + 26813.

It is an arithmetic number, because the mean of its divisors is an integer number (10271625).

Almost surely, 2^321161256 is an apocalyptic number.

321161256 is a gapful number since it is divisible by the number (36) 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 321161256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493038000).

321161256 is an abundant number, since it is smaller than the sum of its proper divisors (664914744).

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

321161256 is a wasteful number, since it uses less digits than its factorization.

321161256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18103 (or 18096 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 321161256 is about 17920.9725182536. The cubic root of 321161256 is about 684.8167631079.

The spelling of 321161256 in words is "three hundred twenty-one million, one hundred sixty-one thousand, two hundred fifty-six".