249943531 has 2 divisors, whose sum is σ = 249943532. Its totient is φ = 249943530.

The previous prime is 249943513. The next prime is 249943559. The reversal of 249943531 is 135349942.

Together with previous prime (249943513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249943531 - 2⁹ = 249943019 is a prime.

It is a super-2 number, since 2×249943531² = 124943537377495922, which contains 22 as substring.

It is equal to p_13676395 and since 249943531 and 13676395 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (249943931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124971765 + 124971766.

It is an arithmetic number, because the mean of its divisors is an integer number (124971766).

Almost surely, 2^249943531 is an apocalyptic number.

249943531 is a deficient number, since it is larger than the sum of its proper divisors (1).

249943531 is an equidigital number, since it uses as much as digits as its factorization.

249943531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 249943531 is about 15809.6024934215. The cubic root of 249943531 is about 629.9130903880.

The spelling of 249943531 in words is "two hundred forty-nine million, nine hundred forty-three thousand, five hundred thirty-one".