22145531 has 8 divisors (see below), whose sum is σ = 23041200. Its totient is φ = 21258720.

The previous prime is 22145521. The next prime is 22145533. The reversal of 22145531 is 13554122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22145531 is a prime.

It is a super-2 number, since 2×22145531² = 980849086543922, 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 = 22145497 and 22145506.

It is not an unprimeable number, because it can be changed into a prime (22145533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3140 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (2880150).

Almost surely, 2^22145531 is an apocalyptic number.

22145531 is a deficient number, since it is larger than the sum of its proper divisors (895669).

22145531 is a wasteful number, since it uses less digits than its factorization.

22145531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4429.

The product of its digits is 1200, while the sum is 23.

The square root of 22145531 is about 4705.9038451715. The cubic root of 22145531 is about 280.8204295910.

Adding to 22145531 its reverse (13554122), we get a palindrome (35699653).

The spelling of 22145531 in words is "twenty-two million, one hundred forty-five thousand, five hundred thirty-one".