22165531 has 4 divisors (see below), whose sum is σ = 22265152. Its totient is φ = 22065912.

The previous prime is 22165513. The next prime is 22165547. The reversal of 22165531 is 13556122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13556122 = 2 ⋅6778061.

It is a cyclic number.

It is not a de Polignac number, because 22165531 - 2¹¹ = 22163483 is a prime.

It is a super-2 number, since 2×22165531² = 982621529023922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22165496 and 22165505.

It is not an unprimeable number, because it can be changed into a prime (22160531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49476 + ... + 49921.

It is an arithmetic number, because the mean of its divisors is an integer number (5566288).

Almost surely, 2^22165531 is an apocalyptic number.

22165531 is a deficient number, since it is larger than the sum of its proper divisors (99621).

22165531 is an equidigital number, since it uses as much as digits as its factorization.

22165531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99620.

The product of its digits is 1800, while the sum is 25.

The square root of 22165531 is about 4708.0283559044. The cubic root of 22165531 is about 280.9049420325.

The spelling of 22165531 in words is "twenty-two million, one hundred sixty-five thousand, five hundred thirty-one".