811099957 has 2 divisors, whose sum is σ = 811099958. Its totient is φ = 811099956.

The previous prime is 811099951. The next prime is 811099999. The reversal of 811099957 is 759990118.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762532996 + 48566961 = 27614^2 + 6969^2 .

It is a cyclic number.

It is not a de Polignac number, because 811099957 - 2¹⁵ = 811067189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 811099957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811099951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405549978 + 405549979.

It is an arithmetic number, because the mean of its divisors is an integer number (405549979).

Almost surely, 2^811099957 is an apocalyptic number.

It is an amenable number.

811099957 is a deficient number, since it is larger than the sum of its proper divisors (1).

811099957 is an equidigital number, since it uses as much as digits as its factorization.

811099957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 811099957 is about 28479.8166602245. The cubic root of 811099957 is about 932.5915142812.

The spelling of 811099957 in words is "eight hundred eleven million, ninety-nine thousand, nine hundred fifty-seven".