164994493 has 4 divisors (see below), whose sum is σ = 170316928. Its totient is φ = 159672060.

The previous prime is 164994481. The next prime is 164994521. The reversal of 164994493 is 394499461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 394499461 = 251 ⋅1571711.

It is a cyclic number.

It is not a de Polignac number, because 164994493 - 2¹³ = 164986301 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 (164994413) 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, 2661171 + ... + 2661232.

It is an arithmetic number, because the mean of its divisors is an integer number (42579232).

Almost surely, 2^164994493 is an apocalyptic number.

It is an amenable number.

164994493 is a deficient number, since it is larger than the sum of its proper divisors (5322435).

164994493 is an equidigital number, since it uses as much as digits as its factorization.

164994493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322434.

The product of its digits is 839808, while the sum is 49.

The square root of 164994493 is about 12845.0182171922. The cubic root of 164994493 is about 548.4745531896.

The spelling of 164994493 in words is "one hundred sixty-four million, nine hundred ninety-four thousand, four hundred ninety-three".