164355989 has 4 divisors (see below), whose sum is σ = 187835424. Its totient is φ = 140876556.

The previous prime is 164355979. The next prime is 164355991. The reversal of 164355989 is 989553461.

It is a happy number.

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 164355989 - 2⁴ = 164355973 is a prime.

It is a super-2 number, since 2×164355989² = 54025782240336242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164355979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11739707 + ... + 11739720.

It is an arithmetic number, because the mean of its divisors is an integer number (46958856).

Almost surely, 2^164355989 is an apocalyptic number.

It is an amenable number.

164355989 is a deficient number, since it is larger than the sum of its proper divisors (23479435).

164355989 is an equidigital number, since it uses as much as digits as its factorization.

164355989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23479434.

The product of its digits is 1166400, while the sum is 50.

The square root of 164355989 is about 12820.1399758349. The cubic root of 164355989 is about 547.7661337587.

The spelling of 164355989 in words is "one hundred sixty-four million, three hundred fifty-five thousand, nine hundred eighty-nine".