164850391 has 4 divisors (see below), whose sum is σ = 164882632. Its totient is φ = 164818152.

The previous prime is 164850383. The next prime is 164850397. The reversal of 164850391 is 193058461.

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

It is a cyclic number.

It is not a de Polignac number, because 164850391 - 2³ = 164850383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164850391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164850397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6561 + ... + 19306.

It is an arithmetic number, because the mean of its divisors is an integer number (41220658).

Almost surely, 2^164850391 is an apocalyptic number.

164850391 is a deficient number, since it is larger than the sum of its proper divisors (32241).

164850391 is an equidigital number, since it uses as much as digits as its factorization.

164850391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32240.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 164850391 is about 12839.4077355616. The cubic root of 164850391 is about 548.3148320999.

The spelling of 164850391 in words is "one hundred sixty-four million, eight hundred fifty thousand, three hundred ninety-one".