249802639 has 2 divisors, whose sum is σ = 249802640. Its totient is φ = 249802638.

The previous prime is 249802613. The next prime is 249802643. The reversal of 249802639 is 936208942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249802639 - 2⁹ = 249802127 is a prime.

It is equal to p_13669099 and since 249802639 and 13669099 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 249802595 and 249802604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249802699) 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, 124901319 + 124901320.

It is an arithmetic number, because the mean of its divisors is an integer number (124901320).

Almost surely, 2^249802639 is an apocalyptic number.

249802639 is a deficient number, since it is larger than the sum of its proper divisors (1).

249802639 is an equidigital number, since it uses as much as digits as its factorization.

249802639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 249802639 is about 15805.1459657923. The cubic root of 249802639 is about 629.7947084533.

The spelling of 249802639 in words is "two hundred forty-nine million, eight hundred two thousand, six hundred thirty-nine".