251261275321 has 12 divisors (see below), whose sum is σ = 292303501200. Its totient is φ = 215352087720.

The previous prime is 251261275319. The next prime is 251261275351. The reversal of 251261275321 is 123572162152.

It is not a de Polignac number, because 251261275321 - 2¹ = 251261275319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251261275301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 582066 + ... + 917236.

It is an arithmetic number, because the mean of its divisors is an integer number (24358625100).

Almost surely, 2^251261275321 is an apocalyptic number.

It is an amenable number.

251261275321 is a deficient number, since it is larger than the sum of its proper divisors (41042225879).

251261275321 is a wasteful number, since it uses less digits than its factorization.

251261275321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350484 (or 350477 counting only the distinct ones).

The product of its digits is 50400, while the sum is 37.

The spelling of 251261275321 in words is "two hundred fifty-one billion, two hundred sixty-one million, two hundred seventy-five thousand, three hundred twenty-one".