251218472 has 8 divisors (see below), whose sum is σ = 471034650. Its totient is φ = 125609232.

The previous prime is 251218459. The next prime is 251218481. The reversal of 251218472 is 274812152.

251218472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 244797316 + 6421156 = 15646^2 + 2534^2 .

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

It is a super-2 number, since 2×251218472² = 126221441348029568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15701147 + ... + 15701162.

Almost surely, 2^251218472 is an apocalyptic number.

It is an amenable number.

251218472 is a deficient number, since it is larger than the sum of its proper divisors (219816178).

251218472 is a wasteful number, since it uses less digits than its factorization.

251218472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31402315 (or 31402311 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 251218472 is about 15849.8729332446. The cubic root of 251218472 is about 630.9823190520.

The spelling of 251218472 in words is "two hundred fifty-one million, two hundred eighteen thousand, four hundred seventy-two".