810900947 has 2 divisors, whose sum is σ = 810900948. Its totient is φ = 810900946.

The previous prime is 810900941. The next prime is 810900973. The reversal of 810900947 is 749009018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 810900947 - 2⁸ = 810900691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 810900947.

It is not a weakly prime, because it can be changed into another prime (810900941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405450473 + 405450474.

It is an arithmetic number, because the mean of its divisors is an integer number (405450474).

Almost surely, 2^810900947 is an apocalyptic number.

810900947 is a deficient number, since it is larger than the sum of its proper divisors (1).

810900947 is an equidigital number, since it uses as much as digits as its factorization.

810900947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 810900947 is about 28476.3225680564. The cubic root of 810900947 is about 932.5152350603.

The spelling of 810900947 in words is "eight hundred ten million, nine hundred thousand, nine hundred forty-seven".