249424139 has 2 divisors, whose sum is σ = 249424140. Its totient is φ = 249424138.

The previous prime is 249424127. The next prime is 249424243. The reversal of 249424139 is 931424942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249424139 - 2¹² = 249420043 is a prime.

It is a super-2 number, since 2×249424139² = 124424802231782642, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (249429139) 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, 124712069 + 124712070.

It is an arithmetic number, because the mean of its divisors is an integer number (124712070).

Almost surely, 2^249424139 is an apocalyptic number.

249424139 is a deficient number, since it is larger than the sum of its proper divisors (1).

249424139 is an equidigital number, since it uses as much as digits as its factorization.

249424139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 249424139 is about 15793.1674783749. The cubic root of 249424139 is about 629.4764601544.

The spelling of 249424139 in words is "two hundred forty-nine million, four hundred twenty-four thousand, one hundred thirty-nine".