249698641 has 2 divisors, whose sum is σ = 249698642. Its totient is φ = 249698640.

The previous prime is 249698629. The next prime is 249698717. The reversal of 249698641 is 146896942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162817600 + 86881041 = 12760^2 + 9321^2 .

It is a cyclic number.

It is not a de Polignac number, because 249698641 - 2¹⁵ = 249665873 is a prime.

It is a super-2 number, since 2×249698641² = 124698822634493762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249698621) 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, 124849320 + 124849321.

It is an arithmetic number, because the mean of its divisors is an integer number (124849321).

Almost surely, 2^249698641 is an apocalyptic number.

It is an amenable number.

249698641 is a deficient number, since it is larger than the sum of its proper divisors (1).

249698641 is an equidigital number, since it uses as much as digits as its factorization.

249698641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 49.

The square root of 249698641 is about 15801.8556188822. The cubic root of 249698641 is about 629.7072974719.

The spelling of 249698641 in words is "two hundred forty-nine million, six hundred ninety-eight thousand, six hundred forty-one".