857678291 has 2 divisors, whose sum is σ = 857678292. Its totient is φ = 857678290.

The previous prime is 857678281. The next prime is 857678329. The reversal of 857678291 is 192876758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 857678291 - 2²⁶ = 790569427 is a prime.

It is a super-2 number, since 2×857678291² = 1471224101705361362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (857678281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428839145 + 428839146.

It is an arithmetic number, because the mean of its divisors is an integer number (428839146).

Almost surely, 2^857678291 is an apocalyptic number.

857678291 is a deficient number, since it is larger than the sum of its proper divisors (1).

857678291 is an equidigital number, since it uses as much as digits as its factorization.

857678291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 53.

The square root of 857678291 is about 29286.1450348113. The cubic root of 857678291 is about 950.1120056305.

The spelling of 857678291 in words is "eight hundred fifty-seven million, six hundred seventy-eight thousand, two hundred ninety-one".