165041531 has 4 divisors (see below), whose sum is σ = 165069432. Its totient is φ = 165013632.

The previous prime is 165041521. The next prime is 165041533. The reversal of 165041531 is 135140561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135140561 = 11617 ⋅11633.

It is a cyclic number.

It is not a de Polignac number, because 165041531 - 2¹⁸ = 164779387 is a prime.

It is a super-2 number, since 2×165041531² = 54477413909647922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165041531.

It is not an unprimeable number, because it can be changed into a prime (165041533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181 + ... + 18206.

It is an arithmetic number, because the mean of its divisors is an integer number (41267358).

Almost surely, 2^165041531 is an apocalyptic number.

165041531 is a deficient number, since it is larger than the sum of its proper divisors (27901).

165041531 is an equidigital number, since it uses as much as digits as its factorization.

165041531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27900.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 165041531 is about 12846.8490689352. The cubic root of 165041531 is about 548.5266694638.

The spelling of 165041531 in words is "one hundred sixty-five million, forty-one thousand, five hundred thirty-one".