251220967 has 2 divisors, whose sum is σ = 251220968. Its totient is φ = 251220966.

The previous prime is 251220953. The next prime is 251221013. The reversal of 251220967 is 769022152.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251220967 is a prime.

It is a super-2 number, since 2×251220967² = 126223948520830178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251223967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125610483 + 125610484.

It is an arithmetic number, because the mean of its divisors is an integer number (125610484).

Almost surely, 2^251220967 is an apocalyptic number.

251220967 is a deficient number, since it is larger than the sum of its proper divisors (1).

251220967 is an equidigital number, since it uses as much as digits as its factorization.

251220967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 251220967 is about 15849.9516403048. The cubic root of 251220967 is about 630.9844079320.

The spelling of 251220967 in words is "two hundred fifty-one million, two hundred twenty thousand, nine hundred sixty-seven".