401431831 has 2 divisors, whose sum is σ = 401431832. Its totient is φ = 401431830.

The previous prime is 401431819. The next prime is 401431837. The reversal of 401431831 is 138134104.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401431831 is a prime.

It is a super-2 number, since 2×401431831² = 322295029880025122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401431796 and 401431805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401431837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200715915 + 200715916.

It is an arithmetic number, because the mean of its divisors is an integer number (200715916).

Almost surely, 2^401431831 is an apocalyptic number.

401431831 is a deficient number, since it is larger than the sum of its proper divisors (1).

401431831 is an equidigital number, since it uses as much as digits as its factorization.

401431831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 401431831 is about 20035.7637987674. The cubic root of 401431831 is about 737.6844045627.

Adding to 401431831 its reverse (138134104), we get a palindrome (539565935).

The spelling of 401431831 in words is "four hundred one million, four hundred thirty-one thousand, eight hundred thirty-one".