161513992 has 16 divisors (see below), whose sum is σ = 313281900. Its totient is φ = 77972160.

The previous prime is 161513983. The next prime is 161514007. The reversal of 161513992 is 299315161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 139854276 + 21659716 = 11826^2 + 4654^2 .

It is a super-2 number, since 2×161513992² = 52173539223552128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347859 + ... + 348322.

Almost surely, 2^161513992 is an apocalyptic number.

It is an amenable number.

161513992 is a deficient number, since it is larger than the sum of its proper divisors (151767908).

161513992 is a wasteful number, since it uses less digits than its factorization.

161513992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696216 (or 696212 counting only the distinct ones).

The product of its digits is 14580, while the sum is 37.

The square root of 161513992 is about 12708.8155230926. The cubic root of 161513992 is about 544.5904866338.

The spelling of 161513992 in words is "one hundred sixty-one million, five hundred thirteen thousand, nine hundred ninety-two".