853564139 has 4 divisors (see below), whose sum is σ = 854039880. Its totient is φ = 853088400.

The previous prime is 853564097. The next prime is 853564171. The reversal of 853564139 is 931465358.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931465358 = 2 ⋅465732679.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853564139 is a prime.

It is a super-2 number, since 2×853564139² = 1457143478773622642, which contains 22 as substring.

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 853564139.

It is not an unprimeable number, because it can be changed into a prime (853564639) 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, 235169 + ... + 238770.

It is an arithmetic number, because the mean of its divisors is an integer number (213509970).

Almost surely, 2^853564139 is an apocalyptic number.

853564139 is a deficient number, since it is larger than the sum of its proper divisors (475741).

853564139 is a wasteful number, since it uses less digits than its factorization.

853564139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475740.

The product of its digits is 388800, while the sum is 44.

The square root of 853564139 is about 29215.8200124522. The cubic root of 853564139 is about 948.5903892313.

The spelling of 853564139 in words is "eight hundred fifty-three million, five hundred sixty-four thousand, one hundred thirty-nine".