251980971 has 16 divisors (see below), whose sum is σ = 379157760. Its totient is φ = 147449120.

The previous prime is 251980909. The next prime is 251980973. The reversal of 251980971 is 179089152.

It is a cyclic number.

It is not a de Polignac number, because 251980971 - 2⁹ = 251980459 is a prime.

It is a super-2 number, since 2×251980971² = 126988819492205682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251980973) 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, 130695 + ... + 132608.

It is an arithmetic number, because the mean of its divisors is an integer number (23697360).

Almost surely, 2^251980971 is an apocalyptic number.

251980971 is a deficient number, since it is larger than the sum of its proper divisors (127176789).

251980971 is a wasteful number, since it uses less digits than its factorization.

251980971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263346.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 251980971 is about 15873.9084979094. The cubic root of 251980971 is about 631.6200606873.

The spelling of 251980971 in words is "two hundred fifty-one million, nine hundred eighty thousand, nine hundred seventy-one".