857579797 has 2 divisors, whose sum is σ = 857579798. Its totient is φ = 857579796.

The previous prime is 857579791. The next prime is 857579861. The reversal of 857579797 is 797975758.

It is an a-pointer prime, because the next prime (857579861) can be obtained adding 857579797 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644448996 + 213130801 = 25386^2 + 14599^2 .

It is a cyclic number.

It is not a de Polignac number, because 857579797 - 2⁷ = 857579669 is a prime.

It is a super-2 number, since 2×857579797² = 1470886216445122418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857579791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428789898 + 428789899.

It is an arithmetic number, because the mean of its divisors is an integer number (428789899).

Almost surely, 2^857579797 is an apocalyptic number.

It is an amenable number.

857579797 is a deficient number, since it is larger than the sum of its proper divisors (1).

857579797 is an equidigital number, since it uses as much as digits as its factorization.

857579797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38896200, while the sum is 64.

The square root of 857579797 is about 29284.4634063867. The cubic root of 857579797 is about 950.0756346060.

The spelling of 857579797 in words is "eight hundred fifty-seven million, five hundred seventy-nine thousand, seven hundred ninety-seven".