400831031 has 2 divisors, whose sum is σ = 400831032. Its totient is φ = 400831030.

The previous prime is 400831019. The next prime is 400831091. The reversal of 400831031 is 130138004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400831031 - 2²² = 396636727 is a prime.

It is a super-2 number, since 2×400831031² = 321331030825045922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 400830994 and 400831012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400831091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200415515 + 200415516.

It is an arithmetic number, because the mean of its divisors is an integer number (200415516).

Almost surely, 2^400831031 is an apocalyptic number.

400831031 is a deficient number, since it is larger than the sum of its proper divisors (1).

400831031 is an equidigital number, since it uses as much as digits as its factorization.

400831031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 400831031 is about 20020.7649953742. The cubic root of 400831031 is about 737.3162041657.

Adding to 400831031 its reverse (130138004), we get a palindrome (530969035).

It can be divided in two parts, 40083 and 1031, that added together give a palindrome (41114).

The spelling of 400831031 in words is "four hundred million, eight hundred thirty-one thousand, thirty-one".