811831985287 has 2 divisors, whose sum is σ = 811831985288. Its totient is φ = 811831985286.

The previous prime is 811831985243. The next prime is 811831985309. The reversal of 811831985287 is 782589138118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 811831985287 - 2²³ = 811823596679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811831925287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405915992643 + 405915992644.

It is an arithmetic number, because the mean of its divisors is an integer number (405915992644).

Almost surely, 2^811831985287 is an apocalyptic number.

811831985287 is a deficient number, since it is larger than the sum of its proper divisors (1).

811831985287 is an equidigital number, since it uses as much as digits as its factorization.

811831985287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 61.

The spelling of 811831985287 in words is "eight hundred eleven billion, eight hundred thirty-one million, nine hundred eighty-five thousand, two hundred eighty-seven".