251161251 has 8 divisors (see below), whose sum is σ = 365325504. Its totient is φ = 152218920.

The previous prime is 251161243. The next prime is 251161271. The reversal of 251161251 is 152161152.

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

It is not a de Polignac number, because 251161251 - 2³ = 251161243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251161241) 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, 3805441 + ... + 3805506.

It is an arithmetic number, because the mean of its divisors is an integer number (45665688).

Almost surely, 2^251161251 is an apocalyptic number.

251161251 is a deficient number, since it is larger than the sum of its proper divisors (114164253).

251161251 is a wasteful number, since it uses less digits than its factorization.

251161251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610961.

The product of its digits is 600, while the sum is 24.

The square root of 251161251 is about 15848.0677371092. The cubic root of 251161251 is about 630.9344083223.

Subtracting from 251161251 its reverse (152161152), we obtain a palindrome (99000099).

The spelling of 251161251 in words is "two hundred fifty-one million, one hundred sixty-one thousand, two hundred fifty-one".