164215691 has 2 divisors, whose sum is σ = 164215692. Its totient is φ = 164215690.

The previous prime is 164215673. The next prime is 164215729. The reversal of 164215691 is 196512461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 164215691 - 2⁶ = 164215627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (164215391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82107845 + 82107846.

It is an arithmetic number, because the mean of its divisors is an integer number (82107846).

Almost surely, 2^164215691 is an apocalyptic number.

164215691 is a deficient number, since it is larger than the sum of its proper divisors (1).

164215691 is an equidigital number, since it uses as much as digits as its factorization.

164215691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 164215691 is about 12814.6670264974. The cubic root of 164215691 is about 547.6102275233.

The spelling of 164215691 in words is "one hundred sixty-four million, two hundred fifteen thousand, six hundred ninety-one".