164831993 has 4 divisors (see below), whose sum is σ = 167292240. Its totient is φ = 162371748.

The previous prime is 164831981. The next prime is 164832001. The reversal of 164831993 is 399138461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 164831993 - 2⁴ = 164831977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (164831923) 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, 1230023 + ... + 1230156.

It is an arithmetic number, because the mean of its divisors is an integer number (41823060).

Almost surely, 2^164831993 is an apocalyptic number.

It is an amenable number.

164831993 is a deficient number, since it is larger than the sum of its proper divisors (2460247).

164831993 is an equidigital number, since it uses as much as digits as its factorization.

164831993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460246.

The product of its digits is 139968, while the sum is 44.

The square root of 164831993 is about 12838.6912495005. The cubic root of 164831993 is about 548.2944332571.

The spelling of 164831993 in words is "one hundred sixty-four million, eight hundred thirty-one thousand, nine hundred ninety-three".