164691223 has 4 divisors (see below), whose sum is σ = 174378960. Its totient is φ = 155003488.

The previous prime is 164691211. The next prime is 164691227. The reversal of 164691223 is 322196461.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164691223 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 (164691227) 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, 4843843 + ... + 4843876.

It is an arithmetic number, because the mean of its divisors is an integer number (43594740).

Almost surely, 2^164691223 is an apocalyptic number.

164691223 is a deficient number, since it is larger than the sum of its proper divisors (9687737).

164691223 is an equidigital number, since it uses as much as digits as its factorization.

164691223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9687736.

The product of its digits is 15552, while the sum is 34.

The square root of 164691223 is about 12833.2078218971. The cubic root of 164691223 is about 548.1383037977.

The spelling of 164691223 in words is "one hundred sixty-four million, six hundred ninety-one thousand, two hundred twenty-three".