249391939 has 2 divisors, whose sum is σ = 249391940. Its totient is φ = 249391938.

The previous prime is 249391913. The next prime is 249391991. The reversal of 249391939 is 939193942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249391939 - 2⁵ = 249391907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249391892 and 249391901.

It is not a weakly prime, because it can be changed into another prime (249392939) 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, 124695969 + 124695970.

It is an arithmetic number, because the mean of its divisors is an integer number (124695970).

Almost surely, 2^249391939 is an apocalyptic number.

249391939 is a deficient number, since it is larger than the sum of its proper divisors (1).

249391939 is an equidigital number, since it uses as much as digits as its factorization.

249391939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 49.

The square root of 249391939 is about 15792.1480172901. The cubic root of 249391939 is about 629.4493710705.

The spelling of 249391939 in words is "two hundred forty-nine million, three hundred ninety-one thousand, nine hundred thirty-nine".