161601597 has 12 divisors (see below), whose sum is σ = 233660700. Its totient is φ = 107625408.

The previous prime is 161601511. The next prime is 161601599. The reversal of 161601597 is 795106161.

It is a happy number.

161601597 is a `hidden beast` number, since 1 + 6 + 1 + 60 + 1 + 597 = 666.

161601597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 58660281 + 102941316 = 7659^2 + 10146^2 .

It is not a de Polignac number, because 161601597 - 2¹⁰ = 161600573 is a prime.

It is a super-2 number, since 2×161601597² = 52230152305900818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161601599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 883 + ... + 17999.

It is an arithmetic number, because the mean of its divisors is an integer number (19471725).

Almost surely, 2^161601597 is an apocalyptic number.

It is an amenable number.

161601597 is a deficient number, since it is larger than the sum of its proper divisors (72059103).

161601597 is a wasteful number, since it uses less digits than its factorization.

161601597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18172 (or 18169 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 161601597 is about 12712.2616791820. The cubic root of 161601597 is about 544.6889305846.

It can be divided in two parts, 16 and 1601597, that added together give a cube (1601613 = 117³).

The spelling of 161601597 in words is "one hundred sixty-one million, six hundred one thousand, five hundred ninety-seven".