240139931 has 2 divisors, whose sum is σ = 240139932. Its totient is φ = 240139930.

The previous prime is 240139903. The next prime is 240139951. The reversal of 240139931 is 139931042.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 240139931 - 2¹⁴ = 240123547 is a prime.

It is a super-2 number, since 2×240139931² = 115334372921369522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (240139901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120069965 + 120069966.

It is an arithmetic number, because the mean of its divisors is an integer number (120069966).

Almost surely, 2^240139931 is an apocalyptic number.

240139931 is a deficient number, since it is larger than the sum of its proper divisors (1).

240139931 is an equidigital number, since it uses as much as digits as its factorization.

240139931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 240139931 is about 15496.4489803309. The cubic root of 240139931 is about 621.5672549899.

The spelling of 240139931 in words is "two hundred forty million, one hundred thirty-nine thousand, nine hundred thirty-one".