161597155 has 16 divisors (see below), whose sum is σ = 206017344. Its totient is φ = 121262080.

The previous prime is 161597143. The next prime is 161597197. The reversal of 161597155 is 551795161.

161597155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161597155 - 2⁵ = 161597123 is a prime.

It is a super-2 number, since 2×161597155² = 52227281008188050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23379 + ... + 29491.

It is an arithmetic number, because the mean of its divisors is an integer number (12876084).

Almost surely, 2^161597155 is an apocalyptic number.

161597155 is a deficient number, since it is larger than the sum of its proper divisors (44420189).

161597155 is a wasteful number, since it uses less digits than its factorization.

161597155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6446.

The product of its digits is 47250, while the sum is 40.

The square root of 161597155 is about 12712.0869647749. The cubic root of 161597155 is about 544.6839398534.

The spelling of 161597155 in words is "one hundred sixty-one million, five hundred ninety-seven thousand, one hundred fifty-five".