872595821 has 2 divisors, whose sum is σ = 872595822. Its totient is φ = 872595820.

The previous prime is 872595799. The next prime is 872595851. The reversal of 872595821 is 128595278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604618921 + 267976900 = 24589^2 + 16370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872595821 is a prime.

It is a super-2 number, since 2×872595821² = 1522846933653328082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (872595851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436297910 + 436297911.

It is an arithmetic number, because the mean of its divisors is an integer number (436297911).

Almost surely, 2^872595821 is an apocalyptic number.

It is an amenable number.

872595821 is a deficient number, since it is larger than the sum of its proper divisors (1).

872595821 is an equidigital number, since it uses as much as digits as its factorization.

872595821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 47.

The square root of 872595821 is about 29539.7329202551. The cubic root of 872595821 is about 955.5887823257.

The spelling of 872595821 in words is "eight hundred seventy-two million, five hundred ninety-five thousand, eight hundred twenty-one".