161149885 has 32 divisors (see below), whose sum is σ = 225947232. Its totient is φ = 109240320.

The previous prime is 161149829. The next prime is 161149889. The reversal of 161149885 is 588941161.

It can be written as a sum of positive squares in 16 ways, for example, as 115154361 + 45995524 = 10731^2 + 6782^2 .

It is not a de Polignac number, because 161149885 - 2¹⁷ = 161018813 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 (161149889) 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, 43527 + ... + 47083.

It is an arithmetic number, because the mean of its divisors is an integer number (7060851).

Almost surely, 2^161149885 is an apocalyptic number.

It is an amenable number.

161149885 is a deficient number, since it is larger than the sum of its proper divisors (64797347).

161149885 is a wasteful number, since it uses less digits than its factorization.

161149885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633.

The product of its digits is 69120, while the sum is 43.

The square root of 161149885 is about 12694.4824628655. The cubic root of 161149885 is about 544.1809485368.

The spelling of 161149885 in words is "one hundred sixty-one million, one hundred forty-nine thousand, eight hundred eighty-five".