249346639 has 2 divisors, whose sum is σ = 249346640. Its totient is φ = 249346638.

The previous prime is 249346631. The next prime is 249346661. The reversal of 249346639 is 936643942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249346639 - 2³ = 249346631 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249346631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124673319 + 124673320.

It is an arithmetic number, because the mean of its divisors is an integer number (124673320).

Almost surely, 2^249346639 is an apocalyptic number.

249346639 is a deficient number, since it is larger than the sum of its proper divisors (1).

249346639 is an equidigital number, since it uses as much as digits as its factorization.

249346639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 46.

The square root of 249346639 is about 15790.7136950804. The cubic root of 249346639 is about 629.4112573244.

The spelling of 249346639 in words is "two hundred forty-nine million, three hundred forty-six thousand, six hundred thirty-nine".