161489688 has 32 divisors (see below), whose sum is σ = 404870400. Its totient is φ = 53677088.

The previous prime is 161489663. The next prime is 161489689. The reversal of 161489688 is 886984161.

It is a self number, because there is not a number n which added to its sum of digits gives 161489688.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161489689) 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, 756 + ... + 17987.

It is an arithmetic number, because the mean of its divisors is an integer number (12652200).

Almost surely, 2^161489688 is an apocalyptic number.

It is an amenable number.

161489688 is an abundant number, since it is smaller than the sum of its proper divisors (243380712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161489688 is a wasteful number, since it uses less digits than its factorization.

161489688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19111 (or 19107 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 161489688 is about 12707.8593004487. The cubic root of 161489688 is about 544.5631693078.

The spelling of 161489688 in words is "one hundred sixty-one million, four hundred eighty-nine thousand, six hundred eighty-eight".