811984487 has 2 divisors, whose sum is σ = 811984488. Its totient is φ = 811984486.

The previous prime is 811984463. The next prime is 811984489. The reversal of 811984487 is 784489118.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 811984487 - 2¹⁸ = 811722343 is a prime.

Together with 811984489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811984489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405992243 + 405992244.

It is an arithmetic number, because the mean of its divisors is an integer number (405992244).

Almost surely, 2^811984487 is an apocalyptic number.

811984487 is a deficient number, since it is larger than the sum of its proper divisors (1).

811984487 is an equidigital number, since it uses as much as digits as its factorization.

811984487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 50.

The square root of 811984487 is about 28495.3414964622. The cubic root of 811984487 is about 932.9303979107.

The spelling of 811984487 in words is "eight hundred eleven million, nine hundred eighty-four thousand, four hundred eighty-seven".