164766991 has 2 divisors, whose sum is σ = 164766992. Its totient is φ = 164766990.

The previous prime is 164766977. The next prime is 164767019. The reversal of 164766991 is 199667461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164766991 is a prime.

It is a super-2 number, since 2×164766991² = 54296322646388162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164766911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82383495 + 82383496.

It is an arithmetic number, because the mean of its divisors is an integer number (82383496).

Almost surely, 2^164766991 is an apocalyptic number.

164766991 is a deficient number, since it is larger than the sum of its proper divisors (1).

164766991 is an equidigital number, since it uses as much as digits as its factorization.

164766991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 164766991 is about 12836.1595113180. The cubic root of 164766991 is about 548.2223499193. Note that the first 3 decimals are identical.

The spelling of 164766991 in words is "one hundred sixty-four million, seven hundred sixty-six thousand, nine hundred ninety-one".