164889989 has 4 divisors (see below), whose sum is σ = 179880000. Its totient is φ = 149899980.

The previous prime is 164889979. The next prime is 164890051. The reversal of 164889989 is 989988461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 164889989 - 2⁴ = 164889973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164889979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7494989 + ... + 7495010.

It is an arithmetic number, because the mean of its divisors is an integer number (44970000).

Almost surely, 2^164889989 is an apocalyptic number.

It is an amenable number.

164889989 is a deficient number, since it is larger than the sum of its proper divisors (14990011).

164889989 is a wasteful number, since it uses less digits than its factorization.

164889989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14990010.

The product of its digits is 8957952, while the sum is 62.

The square root of 164889989 is about 12840.9496922930. The cubic root of 164889989 is about 548.3587313638.

The spelling of 164889989 in words is "one hundred sixty-four million, eight hundred eighty-nine thousand, nine hundred eighty-nine".