251040326291 has 4 divisors (see below), whose sum is σ = 251061330000. Its totient is φ = 251019322584.

The previous prime is 251040326287. The next prime is 251040326311. The reversal of 251040326291 is 192623040152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251040326291 - 2² = 251040326287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251040376291) 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, 10483916 + ... + 10507833.

It is an arithmetic number, because the mean of its divisors is an integer number (62765332500).

Almost surely, 2^251040326291 is an apocalyptic number.

251040326291 is a deficient number, since it is larger than the sum of its proper divisors (21003709).

251040326291 is a wasteful number, since it uses less digits than its factorization.

251040326291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21003708.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 251040326291 in words is "two hundred fifty-one billion, forty million, three hundred twenty-six thousand, two hundred ninety-one".