251398867 has 2 divisors, whose sum is σ = 251398868. Its totient is φ = 251398866.

The previous prime is 251398853. The next prime is 251398891. The reversal of 251398867 is 768893152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251398867 - 2⁷ = 251398739 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251398867.

It is not a weakly prime, because it can be changed into another prime (251398067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125699433 + 125699434.

It is an arithmetic number, because the mean of its divisors is an integer number (125699434).

Almost surely, 2^251398867 is an apocalyptic number.

251398867 is a deficient number, since it is larger than the sum of its proper divisors (1).

251398867 is an equidigital number, since it uses as much as digits as its factorization.

251398867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 251398867 is about 15855.5626516374. The cubic root of 251398867 is about 631.1333148765.

The spelling of 251398867 in words is "two hundred fifty-one million, three hundred ninety-eight thousand, eight hundred sixty-seven".