251497013 has 2 divisors, whose sum is σ = 251497014. Its totient is φ = 251497012.

The previous prime is 251496989. The next prime is 251497049. The reversal of 251497013 is 310794152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230493124 + 21003889 = 15182^2 + 4583^2 .

It is a cyclic number.

It is not a de Polignac number, because 251497013 - 2⁸ = 251496757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251497093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125748506 + 125748507.

It is an arithmetic number, because the mean of its divisors is an integer number (125748507).

Almost surely, 2^251497013 is an apocalyptic number.

It is an amenable number.

251497013 is a deficient number, since it is larger than the sum of its proper divisors (1).

251497013 is an equidigital number, since it uses as much as digits as its factorization.

251497013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 251497013 is about 15858.6573517432. The cubic root of 251497013 is about 631.2154355744.

The spelling of 251497013 in words is "two hundred fifty-one million, four hundred ninety-seven thousand, thirteen".