165531242 has 4 divisors (see below), whose sum is σ = 248296866. Its totient is φ = 82765620.

The previous prime is 165531241. The next prime is 165531251. The reversal of 165531242 is 242135561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242135561 = 373 ⋅649157.

It can be written as a sum of positive squares in only one way, i.e., 147646801 + 17884441 = 12151^2 + 4229^2 .

It is not an unprimeable number, because it can be changed into a prime (165531241) 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 as a sum of consecutive naturals, namely, 41382809 + ... + 41382812.

Almost surely, 2^165531242 is an apocalyptic number.

165531242 is a deficient number, since it is larger than the sum of its proper divisors (82765624).

165531242 is an equidigital number, since it uses as much as digits as its factorization.

165531242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82765623.

The product of its digits is 7200, while the sum is 29.

The square root of 165531242 is about 12865.8945277816. The cubic root of 165531242 is about 549.0686629382.

The spelling of 165531242 in words is "one hundred sixty-five million, five hundred thirty-one thousand, two hundred forty-two".