251630025 has 12 divisors (see below), whose sum is σ = 416028432. Its totient is φ = 134202640.

The previous prime is 251630017. The next prime is 251630033. The reversal of 251630025 is 520036152.

It is an interprime number because it is at equal distance from previous prime (251630017) and next prime (251630033).

It is not a de Polignac number, because 251630025 - 2³ = 251630017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251629977 and 251630004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1677459 + ... + 1677608.

It is an arithmetic number, because the mean of its divisors is an integer number (34669036).

Almost surely, 2^251630025 is an apocalyptic number.

251630025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251630025 is a deficient number, since it is larger than the sum of its proper divisors (164398407).

251630025 is a wasteful number, since it uses less digits than its factorization.

251630025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355080 (or 3355075 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 251630025 is about 15862.8504689416. The cubic root of 251630025 is about 631.3266952528.

Adding to 251630025 its reverse (520036152), we get a palindrome (771666177).

The spelling of 251630025 in words is "two hundred fifty-one million, six hundred thirty thousand, twenty-five".