251020867 has 2 divisors, whose sum is σ = 251020868. Its totient is φ = 251020866.

The previous prime is 251020849. The next prime is 251020871. The reversal of 251020867 is 768020152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251020867 is a prime.

It is a super-2 number, since 2×251020867² = 126022951338863378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251020877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125510433 + 125510434.

It is an arithmetic number, because the mean of its divisors is an integer number (125510434).

Almost surely, 2^251020867 is an apocalyptic number.

251020867 is a deficient number, since it is larger than the sum of its proper divisors (1).

251020867 is an equidigital number, since it uses as much as digits as its factorization.

251020867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 251020867 is about 15843.6380607485. The cubic root of 251020867 is about 630.8168349797.

The spelling of 251020867 in words is "two hundred fifty-one million, twenty thousand, eight hundred sixty-seven".