161932997 has 4 divisors (see below), whose sum is σ = 163536396. Its totient is φ = 160329600.

The previous prime is 161932963. The next prime is 161933021. The reversal of 161932997 is 799239161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75238276 + 86694721 = 8674^2 + 9311^2 .

It is a cyclic number.

It is not a de Polignac number, because 161932997 - 2²⁰ = 160884421 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 (161932957) 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, 801548 + ... + 801749.

It is an arithmetic number, because the mean of its divisors is an integer number (40884099).

Almost surely, 2^161932997 is an apocalyptic number.

It is an amenable number.

161932997 is a deficient number, since it is larger than the sum of its proper divisors (1603399).

161932997 is a wasteful number, since it uses less digits than its factorization.

161932997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603398.

The product of its digits is 183708, while the sum is 47.

The square root of 161932997 is about 12725.2896627150. The cubic root of 161932997 is about 545.0610116024.

The spelling of 161932997 in words is "one hundred sixty-one million, nine hundred thirty-two thousand, nine hundred ninety-seven".