249998131 has 2 divisors, whose sum is σ = 249998132. Its totient is φ = 249998130.

The previous prime is 249998083. The next prime is 249998213. The reversal of 249998131 is 131899942.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249998131 - 2¹⁹ = 249473843 is a prime.

It is a super-2 number, since 2×249998131² = 124998131006986322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249998731) 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, 124999065 + 124999066.

It is an arithmetic number, because the mean of its divisors is an integer number (124999066).

Almost surely, 2^249998131 is an apocalyptic number.

249998131 is a deficient number, since it is larger than the sum of its proper divisors (1).

249998131 is an equidigital number, since it uses as much as digits as its factorization.

249998131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 46.

The square root of 249998131 is about 15811.3291977620. The cubic root of 249998131 is about 629.9589550819.

The spelling of 249998131 in words is "two hundred forty-nine million, nine hundred ninety-eight thousand, one hundred thirty-one".