164992989 has 12 divisors (see below), whose sum is σ = 251507616. Its totient is φ = 94248072.

The previous prime is 164992981. The next prime is 164992991. The reversal of 164992989 is 989299461.

It is not a de Polignac number, because 164992989 - 2³ = 164992981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164992981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57462 + ... + 60264.

It is an arithmetic number, because the mean of its divisors is an integer number (20958968).

Almost surely, 2^164992989 is an apocalyptic number.

It is an amenable number.

164992989 is a deficient number, since it is larger than the sum of its proper divisors (86514627).

164992989 is an frugal number, since it uses more digits than its factorization.

164992989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5616 (or 2813 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 57.

The square root of 164992989 is about 12844.9596729612. The cubic root of 164992989 is about 548.4728866527.

The spelling of 164992989 in words is "one hundred sixty-four million, nine hundred ninety-two thousand, nine hundred eighty-nine".