161887623 has 4 divisors (see below), whose sum is σ = 215850168. Its totient is φ = 107925080.

The previous prime is 161887613. The next prime is 161887637. The reversal of 161887623 is 326788161.

161887623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161887623 - 2⁵ = 161887591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161887613) 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, 26981268 + ... + 26981273.

It is an arithmetic number, because the mean of its divisors is an integer number (53962542).

Almost surely, 2^161887623 is an apocalyptic number.

161887623 is a deficient number, since it is larger than the sum of its proper divisors (53962545).

161887623 is an equidigital number, since it uses as much as digits as its factorization.

161887623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53962544.

The product of its digits is 96768, while the sum is 42.

The square root of 161887623 is about 12723.5067100230. The cubic root of 161887623 is about 545.0100977283.

The spelling of 161887623 in words is "one hundred sixty-one million, eight hundred eighty-seven thousand, six hundred twenty-three".