249501697 has 2 divisors, whose sum is σ = 249501698. Its totient is φ = 249501696.

The previous prime is 249501691. The next prime is 249501701. The reversal of 249501697 is 796105942.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248503696 + 998001 = 15764^2 + 999^2 .

It is a cyclic number.

It is not a de Polignac number, because 249501697 - 2³ = 249501689 is a prime.

It is not a weakly prime, because it can be changed into another prime (249501691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124750848 + 124750849.

It is an arithmetic number, because the mean of its divisors is an integer number (124750849).

Almost surely, 2^249501697 is an apocalyptic number.

It is an amenable number.

249501697 is a deficient number, since it is larger than the sum of its proper divisors (1).

249501697 is an equidigital number, since it uses as much as digits as its factorization.

249501697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 249501697 is about 15795.6227164363. The cubic root of 249501697 is about 629.5416982613.

The spelling of 249501697 in words is "two hundred forty-nine million, five hundred one thousand, six hundred ninety-seven".