164344991 has 2 divisors, whose sum is σ = 164344992. Its totient is φ = 164344990.

The previous prime is 164344883. The next prime is 164344993. The reversal of 164344991 is 199443461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 164344991 - 2²² = 160150687 is a prime.

Together with 164344993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164344993) 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, 82172495 + 82172496.

It is an arithmetic number, because the mean of its divisors is an integer number (82172496).

Almost surely, 2^164344991 is an apocalyptic number.

164344991 is a deficient number, since it is larger than the sum of its proper divisors (1).

164344991 is an equidigital number, since it uses as much as digits as its factorization.

164344991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 164344991 is about 12819.7110341848. The cubic root of 164344991 is about 547.7539154303.

The spelling of 164344991 in words is "one hundred sixty-four million, three hundred forty-four thousand, nine hundred ninety-one".