251325641 has 16 divisors (see below), whose sum is σ = 292017024. Its totient is φ = 211849344.

The previous prime is 251325617. The next prime is 251325647. The reversal of 251325641 is 146523152.

It is a de Polignac number, because none of the positive numbers 2^k-251325641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251325647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284186 + ... + 285068.

It is an arithmetic number, because the mean of its divisors is an integer number (18251064).

Almost surely, 2^251325641 is an apocalyptic number.

It is an amenable number.

251325641 is a deficient number, since it is larger than the sum of its proper divisors (40691383).

251325641 is an equidigital number, since it uses as much as digits as its factorization.

251325641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520.

The product of its digits is 7200, while the sum is 29.

The square root of 251325641 is about 15853.2533254219. The cubic root of 251325641 is about 631.0720313121.

Adding to 251325641 its reverse (146523152), we get a palindrome (397848793).

The spelling of 251325641 in words is "two hundred fifty-one million, three hundred twenty-five thousand, six hundred forty-one".