240431129 has 2 divisors, whose sum is σ = 240431130. Its totient is φ = 240431128.

The previous prime is 240431099. The next prime is 240431131. The reversal of 240431129 is 921134042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135675904 + 104755225 = 11648^2 + 10235^2 .

It is a cyclic number.

It is not a de Polignac number, because 240431129 - 2⁸ = 240430873 is a prime.

Together with 240431131, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 240431098 and 240431107.

It is not a weakly prime, because it can be changed into another prime (240431729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120215564 + 120215565.

It is an arithmetic number, because the mean of its divisors is an integer number (120215565).

Almost surely, 2^240431129 is an apocalyptic number.

It is an amenable number.

240431129 is a deficient number, since it is larger than the sum of its proper divisors (1).

240431129 is an equidigital number, since it uses as much as digits as its factorization.

240431129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 240431129 is about 15505.8417701201. The cubic root of 240431129 is about 621.8183947164.

It can be divided in two parts, 2404 and 31129, that added together give a palindrome (33533).

The spelling of 240431129 in words is "two hundred forty million, four hundred thirty-one thousand, one hundred twenty-nine".