161888923 has 4 divisors (see below), whose sum is σ = 185015920. Its totient is φ = 138761928.

The previous prime is 161888917. The next prime is 161888957. The reversal of 161888923 is 329888161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161888923 - 2⁵ = 161888891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161888123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11563488 + ... + 11563501.

It is an arithmetic number, because the mean of its divisors is an integer number (46253980).

Almost surely, 2^161888923 is an apocalyptic number.

161888923 is a deficient number, since it is larger than the sum of its proper divisors (23126997).

161888923 is an equidigital number, since it uses as much as digits as its factorization.

161888923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23126996.

The product of its digits is 165888, while the sum is 46.

The square root of 161888923 is about 12723.5577964656. The cubic root of 161888923 is about 545.0115565824.

The spelling of 161888923 in words is "one hundred sixty-one million, eight hundred eighty-eight thousand, nine hundred twenty-three".