251040248 has 8 divisors (see below), whose sum is σ = 470700480. Its totient is φ = 125520120.

The previous prime is 251040233. The next prime is 251040271. The reversal of 251040248 is 842040152.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×251040248² = 126042412231803008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 15690008 + ... + 15690023.

It is an arithmetic number, because the mean of its divisors is an integer number (58837560).

Almost surely, 2^251040248 is an apocalyptic number.

It is an amenable number.

251040248 is a deficient number, since it is larger than the sum of its proper divisors (219660232).

251040248 is a wasteful number, since it uses less digits than its factorization.

251040248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31380037 (or 31380033 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 251040248 is about 15844.2496824558. The cubic root of 251040248 is about 630.8330694155.

The spelling of 251040248 in words is "two hundred fifty-one million, forty thousand, two hundred forty-eight".