251130520 has 32 divisors (see below), whose sum is σ = 567317520. Its totient is φ = 100048000.

The previous prime is 251130487. The next prime is 251130553. The reversal of 251130520 is 25031152.

It is an interprime number because it is at equal distance from previous prime (251130487) and next prime (251130553).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2467 + ... + 22546.

Almost surely, 2^251130520 is an apocalyptic number.

251130520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251130520 is an abundant number, since it is smaller than the sum of its proper divisors (316187000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251130520 is a wasteful number, since it uses less digits than its factorization.

251130520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25275 (or 25271 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 251130520 is about 15847.0981570760. The cubic root of 251130520 is about 630.9086744746.

Adding to 251130520 its reverse (25031152), we get a palindrome (276161672).

The spelling of 251130520 in words is "two hundred fifty-one million, one hundred thirty thousand, five hundred twenty".