251230531 has 4 divisors (see below), whose sum is σ = 253718064. Its totient is φ = 248743000.

The previous prime is 251230523. The next prime is 251230549. The reversal of 251230531 is 135032152.

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 251230531 - 2³ = 251230523 is a prime.

It is a super-2 number, since 2×251230531² = 126233559413083922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251230591) 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, 1243615 + ... + 1243816.

It is an arithmetic number, because the mean of its divisors is an integer number (63429516).

Almost surely, 2^251230531 is an apocalyptic number.

251230531 is a deficient number, since it is larger than the sum of its proper divisors (2487533).

251230531 is a wasteful number, since it uses less digits than its factorization.

251230531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487532.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 251230531 is about 15850.2533418239. The cubic root of 251230531 is about 630.9924150374.

Adding to 251230531 its reverse (135032152), we get a palindrome (386262683).

The spelling of 251230531 in words is "two hundred fifty-one million, two hundred thirty thousand, five hundred thirty-one".