249949957 has 2 divisors, whose sum is σ = 249949958. Its totient is φ = 249949956.

The previous prime is 249949951. The next prime is 249949969. The reversal of 249949957 is 759949942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245893761 + 4056196 = 15681^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 249949957 - 2¹⁹ = 249425669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249949951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124974978 + 124974979.

It is an arithmetic number, because the mean of its divisors is an integer number (124974979).

Almost surely, 2^249949957 is an apocalyptic number.

It is an amenable number.

249949957 is a deficient number, since it is larger than the sum of its proper divisors (1).

249949957 is an equidigital number, since it uses as much as digits as its factorization.

249949957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 58.

The square root of 249949957 is about 15809.8057230315. The cubic root of 249949957 is about 629.9184886564.

The spelling of 249949957 in words is "two hundred forty-nine million, nine hundred forty-nine thousand, nine hundred fifty-seven".