816402031 has 2 divisors, whose sum is σ = 816402032. Its totient is φ = 816402030.

The previous prime is 816402017. The next prime is 816402049. The reversal of 816402031 is 130204618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816402031 - 2¹⁵ = 816369263 is a prime.

It is a super-2 number, since 2×816402031² = 1333024552441849922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 816401987 and 816402005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816402011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408201015 + 408201016.

It is an arithmetic number, because the mean of its divisors is an integer number (408201016).

Almost surely, 2^816402031 is an apocalyptic number.

816402031 is a deficient number, since it is larger than the sum of its proper divisors (1).

816402031 is an equidigital number, since it uses as much as digits as its factorization.

816402031 is an evil number, because the sum of its binary digits is even.

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

The square root of 816402031 is about 28572.7497976656. The cubic root of 816402031 is about 934.6191862418.

Adding to 816402031 its reverse (130204618), we get a palindrome (946606649).

The spelling of 816402031 in words is "eight hundred sixteen million, four hundred two thousand, thirty-one".