164542691 has 2 divisors, whose sum is σ = 164542692. Its totient is φ = 164542690.

The previous prime is 164542673. The next prime is 164542733. The reversal of 164542691 is 196245461.

It is a weak prime.

It is an emirp because it is prime and its reverse (196245461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164542691 - 2⁶ = 164542627 is a prime.

It is not a weakly prime, because it can be changed into another prime (164542601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82271345 + 82271346.

It is an arithmetic number, because the mean of its divisors is an integer number (82271346).

Almost surely, 2^164542691 is an apocalyptic number.

164542691 is a deficient number, since it is larger than the sum of its proper divisors (1).

164542691 is an equidigital number, since it uses as much as digits as its factorization.

164542691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 164542691 is about 12827.4194988704. The cubic root of 164542691 is about 547.9734689324.

The spelling of 164542691 in words is "one hundred sixty-four million, five hundred forty-two thousand, six hundred ninety-one".