161597236 has 24 divisors (see below), whose sum is σ = 290343816. Its totient is φ = 78650880.

The previous prime is 161597197. The next prime is 161597239. The reversal of 161597236 is 632795161.

It can be written as a sum of positive squares in 4 ways, for example, as 19749136 + 141848100 = 4444^2 + 11910^2 .

It is a super-2 number, since 2×161597236² = 52227333365679392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161597239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100390 + ... + 101986.

It is an arithmetic number, because the mean of its divisors is an integer number (12097659).

Almost surely, 2^161597236 is an apocalyptic number.

It is an amenable number.

161597236 is a deficient number, since it is larger than the sum of its proper divisors (128746580).

161597236 is a wasteful number, since it uses less digits than its factorization.

161597236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259 (or 2257 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 161597236 is about 12712.0901507187. The cubic root of 161597236 is about 544.6840308603.

The spelling of 161597236 in words is "one hundred sixty-one million, five hundred ninety-seven thousand, two hundred thirty-six".