857029091 has 4 divisors (see below), whose sum is σ = 857089632. Its totient is φ = 856968552.

The previous prime is 857029057. The next prime is 857029097. The reversal of 857029091 is 190920758.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857029091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857029097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3590 + ... + 41556.

It is an arithmetic number, because the mean of its divisors is an integer number (214272408).

Almost surely, 2^857029091 is an apocalyptic number.

857029091 is a deficient number, since it is larger than the sum of its proper divisors (60541).

857029091 is a wasteful number, since it uses less digits than its factorization.

857029091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60540.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 857029091 is about 29275.0591972074. The cubic root of 857029091 is about 949.8722232578.

The spelling of 857029091 in words is "eight hundred fifty-seven million, twenty-nine thousand, ninety-one".