251530231 has 8 divisors (see below), whose sum is σ = 264536064. Its totient is φ = 238696920.

The previous prime is 251530211. The next prime is 251530259. The reversal of 251530231 is 132035152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251530231 - 2⁵ = 251530199 is a prime.

It is a super-2 number, since 2×251530231² = 126534914213826722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251530211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40135 + ... + 45976.

It is an arithmetic number, because the mean of its divisors is an integer number (33067008).

Almost surely, 2^251530231 is an apocalyptic number.

251530231 is a deficient number, since it is larger than the sum of its proper divisors (13005833).

251530231 is a wasteful number, since it uses less digits than its factorization.

251530231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86261.

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

The square root of 251530231 is about 15859.7046315497. The cubic root of 251530231 is about 631.2432248922.

Adding to 251530231 its reverse (132035152), we get a palindrome (383565383).

The spelling of 251530231 in words is "two hundred fifty-one million, five hundred thirty thousand, two hundred thirty-one".