161955983 has 8 divisors (see below), whose sum is σ = 185654400. Its totient is φ = 138398040.

The previous prime is 161955977. The next prime is 161956001. The reversal of 161955983 is 389559161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161955983 - 2⁸ = 161955727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161955973) 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 7 ways as a sum of consecutive naturals, for example, 32633 + ... + 37266.

It is an arithmetic number, because the mean of its divisors is an integer number (23206800).

Almost surely, 2^161955983 is an apocalyptic number.

161955983 is a deficient number, since it is larger than the sum of its proper divisors (23698417).

161955983 is an equidigital number, since it uses as much as digits as its factorization.

161955983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70237.

The product of its digits is 291600, while the sum is 47.

The square root of 161955983 is about 12726.1927928191. The cubic root of 161955983 is about 545.0868004161.

The spelling of 161955983 in words is "one hundred sixty-one million, nine hundred fifty-five thousand, nine hundred eighty-three".