251401131 has 16 divisors (see below), whose sum is σ = 377694720. Its totient is φ = 165238920.

The previous prime is 251401121. The next prime is 251401133. The reversal of 251401131 is 131104152.

251401131 is a `hidden beast` number, since 251 + 401 + 13 + 1 = 666.

It is not a de Polignac number, because 251401131 - 2⁶ = 251401067 is a prime.

It is a super-2 number, since 2×251401131² = 126405057336158322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251401133) 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 15 ways as a sum of consecutive naturals, for example, 63655 + ... + 67488.

It is an arithmetic number, because the mean of its divisors is an integer number (23605920).

Almost surely, 2^251401131 is an apocalyptic number.

251401131 is a deficient number, since it is larger than the sum of its proper divisors (126293589).

251401131 is a wasteful number, since it uses less digits than its factorization.

251401131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131223 (or 131217 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 251401131 is about 15855.6340459787. The cubic root of 251401131 is about 631.1352094508.

Adding to 251401131 its reverse (131104152), we get a palindrome (382505283).

The spelling of 251401131 in words is "two hundred fifty-one million, four hundred one thousand, one hundred thirty-one".