161085639 has 32 divisors (see below), whose sum is σ = 255225600. Its totient is φ = 89084160.

The previous prime is 161085637. The next prime is 161085649. The reversal of 161085639 is 936580161.

It is not a de Polignac number, because 161085639 - 2¹ = 161085637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 161085597 and 161085606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161085637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36072 + ... + 40290.

It is an arithmetic number, because the mean of its divisors is an integer number (7975800).

Almost surely, 2^161085639 is an apocalyptic number.

161085639 is a deficient number, since it is larger than the sum of its proper divisors (94139961).

161085639 is a wasteful number, since it uses less digits than its factorization.

161085639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 161085639 is about 12691.9517411626. The cubic root of 161085639 is about 544.1086222957.

The spelling of 161085639 in words is "one hundred sixty-one million, eighty-five thousand, six hundred thirty-nine".