164689919 has 2 divisors, whose sum is σ = 164689920. Its totient is φ = 164689918.

The previous prime is 164689883. The next prime is 164689933. The reversal of 164689919 is 919986461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164689919 is a prime.

It is a super-2 number, since 2×164689919² = 54245538840453122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164689939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82344959 + 82344960.

It is an arithmetic number, because the mean of its divisors is an integer number (82344960).

Almost surely, 2^164689919 is an apocalyptic number.

164689919 is a deficient number, since it is larger than the sum of its proper divisors (1).

164689919 is an equidigital number, since it uses as much as digits as its factorization.

164689919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 53.

The square root of 164689919 is about 12833.1570161048. The cubic root of 164689919 is about 548.1368571021.

The spelling of 164689919 in words is "one hundred sixty-four million, six hundred eighty-nine thousand, nine hundred nineteen".