249137479 has 2 divisors, whose sum is σ = 249137480. Its totient is φ = 249137478.

The previous prime is 249137477. The next prime is 249137501. The reversal of 249137479 is 974731942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249137479 - 2¹ = 249137477 is a prime.

Together with 249137477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249137477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124568739 + 124568740.

It is an arithmetic number, because the mean of its divisors is an integer number (124568740).

Almost surely, 2^249137479 is an apocalyptic number.

249137479 is a deficient number, since it is larger than the sum of its proper divisors (1).

249137479 is an equidigital number, since it uses as much as digits as its factorization.

249137479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 46.

The square root of 249137479 is about 15784.0894257477. The cubic root of 249137479 is about 629.2352179409.

The spelling of 249137479 in words is "two hundred forty-nine million, one hundred thirty-seven thousand, four hundred seventy-nine".