249999679 has 2 divisors, whose sum is σ = 249999680. Its totient is φ = 249999678.

The previous prime is 249999667. The next prime is 249999683. The reversal of 249999679 is 976999942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249999679 - 2¹⁵ = 249966911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249999679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249999649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124999839 + 124999840.

It is an arithmetic number, because the mean of its divisors is an integer number (124999840).

Almost surely, 2^249999679 is an apocalyptic number.

249999679 is a deficient number, since it is larger than the sum of its proper divisors (1).

249999679 is an equidigital number, since it uses as much as digits as its factorization.

249999679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19840464, while the sum is 64.

The square root of 249999679 is about 15811.3781499273. The cubic root of 249999679 is about 629.9602553242.

The spelling of 249999679 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, six hundred seventy-nine".