251207972 has 6 divisors (see below), whose sum is σ = 439613958. Its totient is φ = 125603984.

The previous prime is 251207959. The next prime is 251207977. The reversal of 251207972 is 279702152.

It can be written as a sum of positive squares in only one way, i.e., 219217636 + 31990336 = 14806^2 + 5656^2 .

It is not an unprimeable number, because it can be changed into a prime (251207977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31400993 + ... + 31401000.

It is an arithmetic number, because the mean of its divisors is an integer number (73268993).

Almost surely, 2^251207972 is an apocalyptic number.

It is an amenable number.

251207972 is a deficient number, since it is larger than the sum of its proper divisors (188405986).

251207972 is a wasteful number, since it uses less digits than its factorization.

251207972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62801997 (or 62801995 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 251207972 is about 15849.5416968441. The cubic root of 251207972 is about 630.9735280230.

The spelling of 251207972 in words is "two hundred fifty-one million, two hundred seven thousand, nine hundred seventy-two".