249476939 has 2 divisors, whose sum is σ = 249476940. Its totient is φ = 249476938.

The previous prime is 249476917. The next prime is 249476959. The reversal of 249476939 is 939674942.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249476939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249476959) 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, 124738469 + 124738470.

It is an arithmetic number, because the mean of its divisors is an integer number (124738470).

Almost surely, 2^249476939 is an apocalyptic number.

249476939 is a deficient number, since it is larger than the sum of its proper divisors (1).

249476939 is an equidigital number, since it uses as much as digits as its factorization.

249476939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 53.

The square root of 249476939 is about 15794.8389988629. The cubic root of 249476939 is about 629.5208744765.

It can be divided in two parts, 249 and 476939, that multiplied together give a palindrome (118757811).

The spelling of 249476939 in words is "two hundred forty-nine million, four hundred seventy-six thousand, nine hundred thirty-nine".