431401331 has 2 divisors, whose sum is σ = 431401332. Its totient is φ = 431401330.

The previous prime is 431401319. The next prime is 431401337. The reversal of 431401331 is 133104134.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 431401331 - 2¹⁸ = 431139187 is a prime.

It is a super-2 number, since 2×431401331² = 372214216777143122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (431401337) 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, 215700665 + 215700666.

It is an arithmetic number, because the mean of its divisors is an integer number (215700666).

Almost surely, 2^431401331 is an apocalyptic number.

431401331 is a deficient number, since it is larger than the sum of its proper divisors (1).

431401331 is an equidigital number, since it uses as much as digits as its factorization.

431401331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 431401331 is about 20770.2029600098. The cubic root of 431401331 is about 755.6032668024.

Adding to 431401331 its reverse (133104134), we get a palindrome (564505465).

The spelling of 431401331 in words is "four hundred thirty-one million, four hundred one thousand, three hundred thirty-one".