872442161 has 2 divisors, whose sum is σ = 872442162. Its totient is φ = 872442160.

The previous prime is 872442149. The next prime is 872442217. The reversal of 872442161 is 161244278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521254561 + 351187600 = 22831^2 + 18740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872442161 is a prime.

It is a super-2 number, since 2×872442161² = 1522310648580699842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (872442101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436221080 + 436221081.

It is an arithmetic number, because the mean of its divisors is an integer number (436221081).

Almost surely, 2^872442161 is an apocalyptic number.

It is an amenable number.

872442161 is a deficient number, since it is larger than the sum of its proper divisors (1).

872442161 is an equidigital number, since it uses as much as digits as its factorization.

872442161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 872442161 is about 29537.1319020652. The cubic root of 872442161 is about 955.5326874768.

The spelling of 872442161 in words is "eight hundred seventy-two million, four hundred forty-two thousand, one hundred sixty-one".