251076947961 has 32 divisors (see below), whose sum is σ = 406259884800. Its totient is φ = 134645999616.

The previous prime is 251076947951. The next prime is 251076947993. The reversal of 251076947961 is 169749670152.

It is a happy number.

It is not a de Polignac number, because 251076947961 - 2⁵ = 251076947929 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (251076947941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 882996 + ... + 1132181.

It is an arithmetic number, because the mean of its divisors is an integer number (12695621400).

Almost surely, 2^251076947961 is an apocalyptic number.

251076947961 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

251076947961 is a deficient number, since it is larger than the sum of its proper divisors (155182936839).

251076947961 is a wasteful number, since it uses less digits than its factorization.

251076947961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015553.

The product of its (nonzero) digits is 5715360, while the sum is 57.

The spelling of 251076947961 in words is "two hundred fifty-one billion, seventy-six million, nine hundred forty-seven thousand, nine hundred sixty-one".