18806831 has 2 divisors, whose sum is σ = 18806832. Its totient is φ = 18806830.

The previous prime is 18806813. The next prime is 18806861. The reversal of 18806831 is 13860881.

It is a happy number.

Together with previous prime (18806813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18806831 is a prime.

It is a super-2 number, since 2×18806831² = 707393784525122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18806791 and 18806800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18806861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9403415 + 9403416.

It is an arithmetic number, because the mean of its divisors is an integer number (9403416).

Almost surely, 2^18806831 is an apocalyptic number.

18806831 is a deficient number, since it is larger than the sum of its proper divisors (1).

18806831 is an equidigital number, since it uses as much as digits as its factorization.

18806831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18806831 is about 4336.6843325287. The cubic root of 18806831 is about 265.9327802332.

The spelling of 18806831 in words is "eighteen million, eight hundred six thousand, eight hundred thirty-one".