22231491 has 4 divisors (see below), whose sum is σ = 29641992. Its totient is φ = 14820992.

The previous prime is 22231481. The next prime is 22231499. The reversal of 22231491 is 19413222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22231491 - 2⁵ = 22231459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22231499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3705246 + ... + 3705251.

It is an arithmetic number, because the mean of its divisors is an integer number (7410498).

Almost surely, 2^22231491 is an apocalyptic number.

22231491 is a deficient number, since it is larger than the sum of its proper divisors (7410501).

22231491 is an equidigital number, since it uses as much as digits as its factorization.

22231491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410500.

The product of its digits is 864, while the sum is 24.

The square root of 22231491 is about 4715.0282077629. The cubic root of 22231491 is about 281.1833042838.

It can be divided in two parts, 22231 and 491, that added together give a palindrome (22722).

The spelling of 22231491 in words is "twenty-two million, two hundred thirty-one thousand, four hundred ninety-one".