800109657 has 10 divisors (see below), whose sum is σ = 1195225658. Its totient is φ = 533406384.

The previous prime is 800109647. The next prime is 800109697. The reversal of 800109657 is 756901008.

It can be written as a sum of positive squares in only one way, i.e., 776402496 + 23707161 = 27864^2 + 4869^2 .

It is not a de Polignac number, because 800109657 - 2¹⁵ = 800076889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (800109647) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4938868 + ... + 4939029.

Almost surely, 2^800109657 is an apocalyptic number.

It is an amenable number.

800109657 is a deficient number, since it is larger than the sum of its proper divisors (395116001).

800109657 is an equidigital number, since it uses as much as digits as its factorization.

800109657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9877909 (or 9877900 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 800109657 is about 28286.2096612466. The cubic root of 800109657 is about 928.3601800103.

The spelling of 800109657 in words is "eight hundred million, one hundred nine thousand, six hundred fifty-seven".