857750813 has 2 divisors, whose sum is σ = 857750814. Its totient is φ = 857750812.

The previous prime is 857750809. The next prime is 857750821. The reversal of 857750813 is 318057758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741908644 + 115842169 = 27238^2 + 10763^2 .

It is a cyclic number.

It is not a de Polignac number, because 857750813 - 2² = 857750809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857750843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428875406 + 428875407.

It is an arithmetic number, because the mean of its divisors is an integer number (428875407).

Almost surely, 2^857750813 is an apocalyptic number.

It is an amenable number.

857750813 is a deficient number, since it is larger than the sum of its proper divisors (1).

857750813 is an equidigital number, since it uses as much as digits as its factorization.

857750813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 44.

The square root of 857750813 is about 29287.3831709151. The cubic root of 857750813 is about 950.1387841564.

The spelling of 857750813 in words is "eight hundred fifty-seven million, seven hundred fifty thousand, eight hundred thirteen".