805939831 has 2 divisors, whose sum is σ = 805939832. Its totient is φ = 805939830.

The previous prime is 805939811. The next prime is 805939837. The reversal of 805939831 is 138939508.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805939831 is a prime.

It is a super-2 number, since 2×805939831² = 1299078022384617122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805939837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402969915 + 402969916.

It is an arithmetic number, because the mean of its divisors is an integer number (402969916).

Almost surely, 2^805939831 is an apocalyptic number.

805939831 is a deficient number, since it is larger than the sum of its proper divisors (1).

805939831 is an equidigital number, since it uses as much as digits as its factorization.

805939831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 805939831 is about 28389.0794320633. The cubic root of 805939831 is about 930.6096249627.

The spelling of 805939831 in words is "eight hundred five million, nine hundred thirty-nine thousand, eight hundred thirty-one".