161905597 has 16 divisors (see below), whose sum is σ = 191423232. Its totient is φ = 134052480.

The previous prime is 161905589. The next prime is 161905643. The reversal of 161905597 is 795509161.

It is a cyclic number.

It is not a de Polignac number, because 161905597 - 2³ = 161905589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161905397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26823 + ... + 32299.

It is an arithmetic number, because the mean of its divisors is an integer number (11963952).

Almost surely, 2^161905597 is an apocalyptic number.

It is an amenable number.

161905597 is a deficient number, since it is larger than the sum of its proper divisors (29517635).

161905597 is a wasteful number, since it uses less digits than its factorization.

161905597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628.

The product of its (nonzero) digits is 85050, while the sum is 43.

The square root of 161905597 is about 12724.2130208512. The cubic root of 161905597 is about 545.0302673761.

The spelling of 161905597 in words is "one hundred sixty-one million, nine hundred five thousand, five hundred ninety-seven".