161322597 has 42 divisors (see below), whose sum is σ = 255689862. Its totient is φ = 101721744.

The previous prime is 161322593. The next prime is 161322599. The reversal of 161322597 is 795223161.

161322597 is a `hidden beast` number, since 1 + 61 + 3 + 2 + 2 + 597 = 666.

It can be written as a sum of positive squares in only one way, i.e., 85266756 + 76055841 = 9234^2 + 8721^2 .

It is not a de Polignac number, because 161322597 - 2² = 161322593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161322593) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 262863 + ... + 263475.

Almost surely, 2^161322597 is an apocalyptic number.

It is an amenable number.

161322597 is a deficient number, since it is larger than the sum of its proper divisors (94367265).

161322597 is an frugal number, since it uses more digits than its factorization.

161322597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 635 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 161322597 is about 12701.2832816216. The cubic root of 161322597 is about 544.3752873316.

The spelling of 161322597 in words is "one hundred sixty-one million, three hundred twenty-two thousand, five hundred ninety-seven".