405131231 has 2 divisors, whose sum is σ = 405131232. Its totient is φ = 405131230.

The previous prime is 405131203. The next prime is 405131257. The reversal of 405131231 is 132131504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405131231 - 2²² = 400936927 is a prime.

It is a super-2 number, since 2×405131231² = 328262628663150722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405131261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202565615 + 202565616.

It is an arithmetic number, because the mean of its divisors is an integer number (202565616).

Almost surely, 2^405131231 is an apocalyptic number.

405131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

405131231 is an equidigital number, since it uses as much as digits as its factorization.

405131231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 405131231 is about 20127.8719938298. The cubic root of 405131231 is about 739.9435256390.

Adding to 405131231 its reverse (132131504), we get a palindrome (537262735).

The spelling of 405131231 in words is "four hundred five million, one hundred thirty-one thousand, two hundred thirty-one".