22742281 has 4 divisors (see below), whose sum is σ = 22751892. Its totient is φ = 22732672.

The previous prime is 22742273. The next prime is 22742303. The reversal of 22742281 is 18224722.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18224722 = 2 ⋅9112361.

It can be written as a sum of positive squares in 2 ways, for example, as 21013056 + 1729225 = 4584^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 22742281 - 2³ = 22742273 is a prime.

It is a super-2 number, since 2×22742281² = 1034422690165922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22742381) 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, 1521 + ... + 6913.

It is an arithmetic number, because the mean of its divisors is an integer number (5687973).

Almost surely, 2^22742281 is an apocalyptic number.

It is an amenable number.

22742281 is a deficient number, since it is larger than the sum of its proper divisors (9611).

22742281 is an equidigital number, since it uses as much as digits as its factorization.

22742281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9610.

The product of its digits is 3584, while the sum is 28.

The square root of 22742281 is about 4768.8867673703. The cubic root of 22742281 is about 283.3205049171.

The spelling of 22742281 in words is "twenty-two million, seven hundred forty-two thousand, two hundred eighty-one".