165126531 has 4 divisors (see below), whose sum is σ = 220168712. Its totient is φ = 110084352.

The previous prime is 165126527. The next prime is 165126539. The reversal of 165126531 is 135621561.

165126531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165126531 - 2² = 165126527 is a prime.

It is a super-2 number, since 2×165126531² = 54533542480187922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165126539) 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, 27521086 + ... + 27521091.

It is an arithmetic number, because the mean of its divisors is an integer number (55042178).

Almost surely, 2^165126531 is an apocalyptic number.

165126531 is a deficient number, since it is larger than the sum of its proper divisors (55042181).

165126531 is an equidigital number, since it uses as much as digits as its factorization.

165126531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55042180.

The product of its digits is 5400, while the sum is 30.

The square root of 165126531 is about 12850.1568472918. The cubic root of 165126531 is about 548.6208210483.

It can be divided in two parts, 1651 and 26531, that added together give a palindrome (28182).

The spelling of 165126531 in words is "one hundred sixty-five million, one hundred twenty-six thousand, five hundred thirty-one".