165144531 has 16 divisors (see below), whose sum is σ = 237692160. Its totient is φ = 101676960.

The previous prime is 165144487. The next prime is 165144547. The reversal of 165144531 is 135441561.

It is a happy number.

It is not a de Polignac number, because 165144531 - 2¹⁰ = 165143507 is a prime.

It is a super-2 number, since 2×165144531² = 54545432238419922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165144571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39265 + ... + 43266.

It is an arithmetic number, because the mean of its divisors is an integer number (14855760).

Almost surely, 2^165144531 is an apocalyptic number.

165144531 is a deficient number, since it is larger than the sum of its proper divisors (72547629).

165144531 is a wasteful number, since it uses less digits than its factorization.

165144531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82586.

The product of its digits is 7200, while the sum is 30.

The square root of 165144531 is about 12850.8572087624. The cubic root of 165144531 is about 548.6407548851.

The spelling of 165144531 in words is "one hundred sixty-five million, one hundred forty-four thousand, five hundred thirty-one".