800507861 has 2 divisors, whose sum is σ = 800507862. Its totient is φ = 800507860.

The previous prime is 800507803. The next prime is 800507891. The reversal of 800507861 is 168705008.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 721191025 + 79316836 = 26855^2 + 8906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-800507861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (800507891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400253930 + 400253931.

It is an arithmetic number, because the mean of its divisors is an integer number (400253931).

Almost surely, 2^800507861 is an apocalyptic number.

It is an amenable number.

800507861 is a deficient number, since it is larger than the sum of its proper divisors (1).

800507861 is an equidigital number, since it uses as much as digits as its factorization.

800507861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 800507861 is about 28293.2476220034. The cubic root of 800507861 is about 928.5141653310.

The spelling of 800507861 in words is "eight hundred million, five hundred seven thousand, eight hundred sixty-one".