249748979 has 2 divisors, whose sum is σ = 249748980. Its totient is φ = 249748978.

The previous prime is 249748969. The next prime is 249748991. The reversal of 249748979 is 979847942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249748979 - 2⁴ = 249748963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249748949) 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, 124874489 + 124874490.

It is an arithmetic number, because the mean of its divisors is an integer number (124874490).

Almost surely, 2^249748979 is an apocalyptic number.

249748979 is a deficient number, since it is larger than the sum of its proper divisors (1).

249748979 is an equidigital number, since it uses as much as digits as its factorization.

249748979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The square root of 249748979 is about 15803.4483262356. The cubic root of 249748979 is about 629.7496099116.

The spelling of 249748979 in words is "two hundred forty-nine million, seven hundred forty-eight thousand, nine hundred seventy-nine".