164421691 has 8 divisors (see below), whose sum is σ = 188754944. Its totient is φ = 140299560.

The previous prime is 164421689. The next prime is 164421701. The reversal of 164421691 is 196124461.

It is a happy number.

164421691 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 164421691 - 2¹ = 164421689 is a prime.

It is a super-3 number, since 3×164421691³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (164421601) 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, 51105 + ... + 54226.

It is an arithmetic number, because the mean of its divisors is an integer number (23594368).

Almost surely, 2^164421691 is an apocalyptic number.

164421691 is a deficient number, since it is larger than the sum of its proper divisors (24333253).

164421691 is a wasteful number, since it uses less digits than its factorization.

164421691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105561.

The product of its digits is 10368, while the sum is 34.

The square root of 164421691 is about 12822.7021723192. The cubic root of 164421691 is about 547.8391146424.

The spelling of 164421691 in words is "one hundred sixty-four million, four hundred twenty-one thousand, six hundred ninety-one".