161987794 has 16 divisors (see below), whose sum is σ = 257209920. Its totient is φ = 76381200.

The previous prime is 161987783. The next prime is 161987801. The reversal of 161987794 is 497789161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29982 + ... + 34969.

It is an arithmetic number, because the mean of its divisors is an integer number (16075620).

Almost surely, 2^161987794 is an apocalyptic number.

161987794 is a deficient number, since it is larger than the sum of its proper divisors (95222126).

161987794 is a wasteful number, since it uses less digits than its factorization.

161987794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65025.

The product of its digits is 762048, while the sum is 52.

The square root of 161987794 is about 12727.4425553604. The cubic root of 161987794 is about 545.1224862873.

The spelling of 161987794 in words is "one hundred sixty-one million, nine hundred eighty-seven thousand, seven hundred ninety-four".