164897791 has 2 divisors, whose sum is σ = 164897792. Its totient is φ = 164897790.

The previous prime is 164897783. The next prime is 164897801. The reversal of 164897791 is 197798461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 164897791 - 2³ = 164897783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164897731) 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 as a sum of consecutive naturals, namely, 82448895 + 82448896.

It is an arithmetic number, because the mean of its divisors is an integer number (82448896).

Almost surely, 2^164897791 is an apocalyptic number.

164897791 is a deficient number, since it is larger than the sum of its proper divisors (1).

164897791 is an equidigital number, since it uses as much as digits as its factorization.

164897791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 52.

The square root of 164897791 is about 12841.2534824292. The cubic root of 164897791 is about 548.3673800137.

The spelling of 164897791 in words is "one hundred sixty-four million, eight hundred ninety-seven thousand, seven hundred ninety-one".