251600231261 has 4 divisors (see below), whose sum is σ = 251601664224. Its totient is φ = 251598798300.

The previous prime is 251600231203. The next prime is 251600231269. The reversal of 251600231261 is 162132006152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251600231261 - 2²⁶ = 251533122397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251600231269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409175 + ... + 818916.

It is an arithmetic number, because the mean of its divisors is an integer number (62900416056).

Almost surely, 2^251600231261 is an apocalyptic number.

It is an amenable number.

251600231261 is a deficient number, since it is larger than the sum of its proper divisors (1432963).

251600231261 is a wasteful number, since it uses less digits than its factorization.

251600231261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432962.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 251600231261 in words is "two hundred fifty-one billion, six hundred million, two hundred thirty-one thousand, two hundred sixty-one".