251928961351 has 4 divisors (see below), whose sum is σ = 253038780792. Its totient is φ = 250819141912.

The previous prime is 251928961331. The next prime is 251928961357. The reversal of 251928961351 is 153169829152.

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 251928961351 - 2⁹ = 251928960839 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 (251928961357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554909380 + ... + 554909833.

It is an arithmetic number, because the mean of its divisors is an integer number (63259695198).

Almost surely, 2^251928961351 is an apocalyptic number.

251928961351 is a deficient number, since it is larger than the sum of its proper divisors (1109819441).

251928961351 is a wasteful number, since it uses less digits than its factorization.

251928961351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109819440.

The product of its digits is 1166400, while the sum is 52.

The spelling of 251928961351 in words is "two hundred fifty-one billion, nine hundred twenty-eight million, nine hundred sixty-one thousand, three hundred fifty-one".