401431819 has 2 divisors, whose sum is σ = 401431820. Its totient is φ = 401431818.

The previous prime is 401431817. The next prime is 401431831. The reversal of 401431819 is 918134104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401431819 - 2¹ = 401431817 is a prime.

It is a super-2 number, since 2×401431819² = 322295010611297522, which contains 22 as substring.

Together with 401431817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (401431817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200715909 + 200715910.

It is an arithmetic number, because the mean of its divisors is an integer number (200715910).

Almost surely, 2^401431819 is an apocalyptic number.

401431819 is a deficient number, since it is larger than the sum of its proper divisors (1).

401431819 is an equidigital number, since it uses as much as digits as its factorization.

401431819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 401431819 is about 20035.7634993029. The cubic root of 401431819 is about 737.6843972122.

The spelling of 401431819 in words is "four hundred one million, four hundred thirty-one thousand, eight hundred nineteen".