165741989 has 16 divisors (see below), whose sum is σ = 197164800. Its totient is φ = 136316544.

The previous prime is 165741973. The next prime is 165741991. The reversal of 165741989 is 989147561.

It is not a de Polignac number, because 165741989 - 2⁴ = 165741973 is a prime.

It is a super-2 number, since 2×165741989² = 54940813835352242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165741689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31457 + ... + 36345.

It is an arithmetic number, because the mean of its divisors is an integer number (12322800).

Almost surely, 2^165741989 is an apocalyptic number.

It is an amenable number.

165741989 is a deficient number, since it is larger than the sum of its proper divisors (31422811).

165741989 is a wasteful number, since it uses less digits than its factorization.

165741989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5092.

The product of its digits is 544320, while the sum is 50.

The square root of 165741989 is about 12874.0820643648. The cubic root of 165741989 is about 549.3015807030.

The spelling of 165741989 in words is "one hundred sixty-five million, seven hundred forty-one thousand, nine hundred eighty-nine".