249950639 has 2 divisors, whose sum is σ = 249950640. Its totient is φ = 249950638.

The previous prime is 249950587. The next prime is 249950641. The reversal of 249950639 is 936059942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249950639 - 2²⁰ = 248902063 is a prime.

It is a Sophie Germain prime.

Together with 249950641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 249950593 and 249950602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249950699) 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, 124975319 + 124975320.

It is an arithmetic number, because the mean of its divisors is an integer number (124975320).

Almost surely, 2^249950639 is an apocalyptic number.

249950639 is a deficient number, since it is larger than the sum of its proper divisors (1).

249950639 is an equidigital number, since it uses as much as digits as its factorization.

249950639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 47.

The square root of 249950639 is about 15809.8272919093. The cubic root of 249950639 is about 629.9190615765.

The spelling of 249950639 in words is "two hundred forty-nine million, nine hundred fifty thousand, six hundred thirty-nine".