240431131 has 2 divisors, whose sum is σ = 240431132. Its totient is φ = 240431130.

The previous prime is 240431129. The next prime is 240431137. The reversal of 240431131 is 131134042.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 240431131 - 2¹ = 240431129 is a prime.

It is a super-2 number, since 2×240431131² = 115614257507878322, which contains 22 as substring.

Together with 240431129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 240431099 and 240431108.

It is not a weakly prime, because it can be changed into another prime (240431137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120215565 + 120215566.

It is an arithmetic number, because the mean of its divisors is an integer number (120215566).

Almost surely, 2^240431131 is an apocalyptic number.

240431131 is a deficient number, since it is larger than the sum of its proper divisors (1).

240431131 is an equidigital number, since it uses as much as digits as its factorization.

240431131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 240431131 is about 15505.8418346119. The cubic root of 240431131 is about 621.8183964406.

Adding to 240431131 its reverse (131134042), we get a palindrome (371565173).

The spelling of 240431131 in words is "two hundred forty million, four hundred thirty-one thousand, one hundred thirty-one".