22145261 has 4 divisors (see below), whose sum is σ = 22156224. Its totient is φ = 22134300.

The previous prime is 22145243. The next prime is 22145269. The reversal of 22145261 is 16254122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22145261 - 2¹⁴ = 22128877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22145269) 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, 1475 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (5539056).

Almost surely, 2^22145261 is an apocalyptic number.

It is an amenable number.

22145261 is a deficient number, since it is larger than the sum of its proper divisors (10963).

22145261 is an equidigital number, since it uses as much as digits as its factorization.

22145261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962.

The product of its digits is 960, while the sum is 23.

The square root of 22145261 is about 4705.8751577151. The cubic root of 22145261 is about 280.8192883250.

Adding to 22145261 its reverse (16254122), we get a palindrome (38399383).

The spelling of 22145261 in words is "twenty-two million, one hundred forty-five thousand, two hundred sixty-one".