251268071 has 4 divisors (see below), whose sum is σ = 256009032. Its totient is φ = 246527112.

The previous prime is 251268067. The next prime is 251268139. The reversal of 251268071 is 170862152.

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

It is a cyclic number.

It is not a de Polignac number, because 251268071 - 2² = 251268067 is a prime.

It is a super-2 number, since 2×251268071² = 126271287008122082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251268011) 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, 2370401 + ... + 2370506.

It is an arithmetic number, because the mean of its divisors is an integer number (64002258).

Almost surely, 2^251268071 is an apocalyptic number.

251268071 is a deficient number, since it is larger than the sum of its proper divisors (4740961).

251268071 is an equidigital number, since it uses as much as digits as its factorization.

251268071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740960.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 251268071 is about 15851.4375057911. The cubic root of 251268071 is about 631.0238420504.

The spelling of 251268071 in words is "two hundred fifty-one million, two hundred sixty-eight thousand, seventy-one".