857282091 has 8 divisors (see below), whose sum is σ = 1179915264. Its totient is φ = 553085160.

The previous prime is 857282089. The next prime is 857282113. The reversal of 857282091 is 190282758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 857282091 - 2¹ = 857282089 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (857282011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4608951 + ... + 4609136.

It is an arithmetic number, because the mean of its divisors is an integer number (147489408).

Almost surely, 2^857282091 is an apocalyptic number.

857282091 is a deficient number, since it is larger than the sum of its proper divisors (322633173).

857282091 is a wasteful number, since it uses less digits than its factorization.

857282091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9218121.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 857282091 is about 29279.3799626973. The cubic root of 857282091 is about 949.9656833403.

The spelling of 857282091 in words is "eight hundred fifty-seven million, two hundred eighty-two thousand, ninety-one".