161923119 has 4 divisors (see below), whose sum is σ = 215897496. Its totient is φ = 107948744.

The previous prime is 161923103. The next prime is 161923133. The reversal of 161923119 is 911329161.

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 161923119 - 2⁴ = 161923103 is a prime.

It is a super-2 number, since 2×161923119² = 52438192933376322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161923119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161923019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26987184 + ... + 26987189.

It is an arithmetic number, because the mean of its divisors is an integer number (53974374).

Almost surely, 2^161923119 is an apocalyptic number.

161923119 is a deficient number, since it is larger than the sum of its proper divisors (53974377).

161923119 is an equidigital number, since it uses as much as digits as its factorization.

161923119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53974376.

The product of its digits is 2916, while the sum is 33.

The square root of 161923119 is about 12724.9015320355. The cubic root of 161923119 is about 545.0499283720.

The spelling of 161923119 in words is "one hundred sixty-one million, nine hundred twenty-three thousand, one hundred nineteen".