251163271 has 4 divisors (see below), whose sum is σ = 259265344. Its totient is φ = 243061200.

The previous prime is 251163259. The next prime is 251163293. The reversal of 251163271 is 172361152.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251163271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251163571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4050990 + ... + 4051051.

It is an arithmetic number, because the mean of its divisors is an integer number (64816336).

Almost surely, 2^251163271 is an apocalyptic number.

251163271 is a deficient number, since it is larger than the sum of its proper divisors (8102073).

251163271 is an equidigital number, since it uses as much as digits as its factorization.

251163271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8102072.

The product of its digits is 2520, while the sum is 28.

The square root of 251163271 is about 15848.1314671478. The cubic root of 251163271 is about 630.9360997776.

It can be divided in two parts, 25116327 and 1, that added together give a triangular number (25116328 = T₇₀₈₇).

The spelling of 251163271 in words is "two hundred fifty-one million, one hundred sixty-three thousand, two hundred seventy-one".