249689497 has 2 divisors, whose sum is σ = 249689498. Its totient is φ = 249689496.

The previous prime is 249689483. The next prime is 249689501. The reversal of 249689497 is 794986942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237745561 + 11943936 = 15419^2 + 3456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249689497 is a prime.

It is a super-2 number, since 2×249689497² = 124689689824226018, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249689417) 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, 124844748 + 124844749.

It is an arithmetic number, because the mean of its divisors is an integer number (124844749).

Almost surely, 2^249689497 is an apocalyptic number.

It is an amenable number.

249689497 is a deficient number, since it is larger than the sum of its proper divisors (1).

249689497 is an equidigital number, since it uses as much as digits as its factorization.

249689497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 58.

The square root of 249689497 is about 15801.5662831252. The cubic root of 249689497 is about 629.6996107209.

The spelling of 249689497 in words is "two hundred forty-nine million, six hundred eighty-nine thousand, four hundred ninety-seven".