160991924 has 6 divisors (see below), whose sum is σ = 281735874. Its totient is φ = 80495960.

The previous prime is 160991923. The next prime is 160991939. The reversal of 160991924 is 429199061.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 157502500 + 3489424 = 12550^2 + 1868^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160991923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20123987 + ... + 20123994.

It is an arithmetic number, because the mean of its divisors is an integer number (46955979).

Almost surely, 2^160991924 is an apocalyptic number.

It is an amenable number.

160991924 is a deficient number, since it is larger than the sum of its proper divisors (120743950).

160991924 is a wasteful number, since it uses less digits than its factorization.

160991924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40247985 (or 40247983 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 160991924 is about 12688.2592974765. The cubic root of 160991924 is about 544.0030862354.

The spelling of 160991924 in words is "one hundred sixty million, nine hundred ninety-one thousand, nine hundred twenty-four".