161281588 has 24 divisors (see below), whose sum is σ = 305078312. Its totient is φ = 74162304.

The previous prime is 161281583. The next prime is 161281591. The reversal of 161281588 is 885182161.

161281588 is digitally balanced in base 3, 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 4 ways, for example, as 2471184 + 158810404 = 1572^2 + 12602^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161281588.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161281583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8806 + ... + 20002.

Almost surely, 2^161281588 is an apocalyptic number.

It is an amenable number.

161281588 is a deficient number, since it is larger than the sum of its proper divisors (143796724).

161281588 is a wasteful number, since it uses less digits than its factorization.

161281588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11491 (or 11489 counting only the distinct ones).

The product of its digits is 30720, while the sum is 40.

The square root of 161281588 is about 12699.6688145794. The cubic root of 161281588 is about 544.3291557946.

The spelling of 161281588 in words is "one hundred sixty-one million, two hundred eighty-one thousand, five hundred eighty-eight".