809397157 has 2 divisors, whose sum is σ = 809397158. Its totient is φ = 809397156.

The previous prime is 809397143. The next prime is 809397167. The reversal of 809397157 is 751793908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784056001 + 25341156 = 28001^2 + 5034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809397157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 809397157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809397137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404698578 + 404698579.

It is an arithmetic number, because the mean of its divisors is an integer number (404698579).

Almost surely, 2^809397157 is an apocalyptic number.

It is an amenable number.

809397157 is a deficient number, since it is larger than the sum of its proper divisors (1).

809397157 is an equidigital number, since it uses as much as digits as its factorization.

809397157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 49.

The square root of 809397157 is about 28449.9060982633. The cubic root of 809397157 is about 931.9384384206.

The spelling of 809397157 in words is "eight hundred nine million, three hundred ninety-seven thousand, one hundred fifty-seven".