857142091 has 16 divisors (see below), whose sum is σ = 1000115424. Its totient is φ = 727340544.

The previous prime is 857142073. The next prime is 857142109. The reversal of 857142091 is 190241758.

It is an interprime number because it is at equal distance from previous prime (857142073) and next prime (857142109).

It is a cyclic number.

It is not a de Polignac number, because 857142091 - 2⁵ = 857142059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 857142091.

It is not an unprimeable number, because it can be changed into a prime (857142061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35596 + ... + 54601.

It is an arithmetic number, because the mean of its divisors is an integer number (62507214).

Almost surely, 2^857142091 is an apocalyptic number.

857142091 is a deficient number, since it is larger than the sum of its proper divisors (142973333).

857142091 is a wasteful number, since it uses less digits than its factorization.

857142091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90270.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 857142091 is about 29276.9891040728. The cubic root of 857142091 is about 949.9139685712.

The spelling of 857142091 in words is "eight hundred fifty-seven million, one hundred forty-two thousand, ninety-one".