161911516 has 12 divisors (see below), whose sum is σ = 305141032. Its totient is φ = 74728368.

The previous prime is 161911511. The next prime is 161911531. The reversal of 161911516 is 615119161.

161911516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161911511) 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, 1556790 + ... + 1556893.

Almost surely, 2^161911516 is an apocalyptic number.

It is an amenable number.

161911516 is a deficient number, since it is larger than the sum of its proper divisors (143229516).

161911516 is a wasteful number, since it uses less digits than its factorization.

161911516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113700 (or 3113698 counting only the distinct ones).

The product of its digits is 1620, while the sum is 31.

The square root of 161911516 is about 12724.4456067838. The cubic root of 161911516 is about 545.0369090959.

The spelling of 161911516 in words is "one hundred sixty-one million, nine hundred eleven thousand, five hundred sixteen".