857912061 has 4 divisors (see below), whose sum is σ = 1143882752. Its totient is φ = 571941372.

The previous prime is 857912059. The next prime is 857912063. The reversal of 857912061 is 160219758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (857912059) and next prime (857912063).

It is not a de Polignac number, because 857912061 - 2¹ = 857912059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857912063) 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 3 ways as a sum of consecutive naturals, for example, 142985341 + ... + 142985346.

It is an arithmetic number, because the mean of its divisors is an integer number (285970688).

Almost surely, 2^857912061 is an apocalyptic number.

It is an amenable number.

857912061 is a deficient number, since it is larger than the sum of its proper divisors (285970691).

857912061 is a wasteful number, since it uses less digits than its factorization.

857912061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285970690.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 857912061 is about 29290.1358993092. The cubic root of 857912061 is about 950.1983190768.

The spelling of 857912061 in words is "eight hundred fifty-seven million, nine hundred twelve thousand, sixty-one".