164972591 has 8 divisors (see below), whose sum is σ = 188625024. Its totient is φ = 141341400.

The previous prime is 164972579. The next prime is 164972657. The reversal of 164972591 is 195279461.

164972591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 164972591 - 2⁶ = 164972527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164972531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18416 + ... + 25866.

It is an arithmetic number, because the mean of its divisors is an integer number (23578128).

Almost surely, 2^164972591 is an apocalyptic number.

164972591 is a deficient number, since it is larger than the sum of its proper divisors (23652433).

164972591 is an equidigital number, since it uses as much as digits as its factorization.

164972591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10621.

The product of its digits is 136080, while the sum is 44.

The square root of 164972591 is about 12844.1656404766. The cubic root of 164972591 is about 548.4502832457.

The spelling of 164972591 in words is "one hundred sixty-four million, nine hundred seventy-two thousand, five hundred ninety-one".