22481491 has 4 divisors (see below), whose sum is σ = 22491000. Its totient is φ = 22471984.

The previous prime is 22481453. The next prime is 22481507. The reversal of 22481491 is 19418422.

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.

It is a cyclic number.

It is not a de Polignac number, because 22481491 - 2⁷ = 22481363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22481791) 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, 1860 + ... + 6958.

It is an arithmetic number, because the mean of its divisors is an integer number (5622750).

Almost surely, 2^22481491 is an apocalyptic number.

22481491 is a deficient number, since it is larger than the sum of its proper divisors (9509).

22481491 is an equidigital number, since it uses as much as digits as its factorization.

22481491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9508.

The product of its digits is 4608, while the sum is 31.

The square root of 22481491 is about 4741.4650689423. The cubic root of 22481491 is about 282.2333757128.

The spelling of 22481491 in words is "twenty-two million, four hundred eighty-one thousand, four hundred ninety-one".