401405231 has 2 divisors, whose sum is σ = 401405232. Its totient is φ = 401405230.

The previous prime is 401405227. The next prime is 401405237. The reversal of 401405231 is 132504104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401405231 - 2² = 401405227 is a prime.

It is a super-2 number, since 2×401405231² = 322252318948326722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401405237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200702615 + 200702616.

It is an arithmetic number, because the mean of its divisors is an integer number (200702616).

Almost surely, 2^401405231 is an apocalyptic number.

401405231 is a deficient number, since it is larger than the sum of its proper divisors (1).

401405231 is an equidigital number, since it uses as much as digits as its factorization.

401405231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 401405231 is about 20035.0999747942. The cubic root of 401405231 is about 737.6681105230.

Adding to 401405231 its reverse (132504104), we get a palindrome (533909335).

The spelling of 401405231 in words is "four hundred one million, four hundred five thousand, two hundred thirty-one".