249640751 has 2 divisors, whose sum is σ = 249640752. Its totient is φ = 249640750.

The previous prime is 249640693. The next prime is 249640763. The reversal of 249640751 is 157046942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249640751 - 2⁶ = 249640687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249640771) 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, 124820375 + 124820376.

It is an arithmetic number, because the mean of its divisors is an integer number (124820376).

Almost surely, 2^249640751 is an apocalyptic number.

249640751 is a deficient number, since it is larger than the sum of its proper divisors (1).

249640751 is an equidigital number, since it uses as much as digits as its factorization.

249640751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 249640751 is about 15800.0237658049. The cubic root of 249640751 is about 629.6586300425.

The spelling of 249640751 in words is "two hundred forty-nine million, six hundred forty thousand, seven hundred fifty-one".