165125989 has 8 divisors (see below), whose sum is σ = 191532608. Its totient is φ = 139423680.

The previous prime is 165125969. The next prime is 165126001. The reversal of 165125989 is 989521561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165125989 - 2⁵ = 165125957 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 (165125959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175572 + ... + 176509.

It is an arithmetic number, because the mean of its divisors is an integer number (23941576).

Almost surely, 2^165125989 is an apocalyptic number.

It is an amenable number.

165125989 is a deficient number, since it is larger than the sum of its proper divisors (26406619).

165125989 is an equidigital number, since it uses as much as digits as its factorization.

165125989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352155.

The product of its digits is 194400, while the sum is 46.

The square root of 165125989 is about 12850.1357580377. The cubic root of 165125989 is about 548.6202207959.

The spelling of 165125989 in words is "one hundred sixty-five million, one hundred twenty-five thousand, nine hundred eighty-nine".