811835131 has 2 divisors, whose sum is σ = 811835132. Its totient is φ = 811835130.

The previous prime is 811835113. The next prime is 811835159. The reversal of 811835131 is 131538118.

Together with previous prime (811835113) 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-811835131 is a prime.

It is a super-2 number, since 2×811835131² = 1318152559851574322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 811835093 and 811835102.

It is not a weakly prime, because it can be changed into another prime (811835111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405917565 + 405917566.

It is an arithmetic number, because the mean of its divisors is an integer number (405917566).

Almost surely, 2^811835131 is an apocalyptic number.

811835131 is a deficient number, since it is larger than the sum of its proper divisors (1).

811835131 is an equidigital number, since it uses as much as digits as its factorization.

811835131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 811835131 is about 28492.7206668651. The cubic root of 811835131 is about 932.8731934941.

The spelling of 811835131 in words is "eight hundred eleven million, eight hundred thirty-five thousand, one hundred thirty-one".