22131591 has 8 divisors (see below), whose sum is σ = 29583984. Its totient is φ = 14716800.

The previous prime is 22131583. The next prime is 22131607. The reversal of 22131591 is 19513122.

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

It is not a de Polignac number, because 22131591 - 2³ = 22131583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131521) 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 7 ways as a sum of consecutive naturals, for example, 7996 + ... + 10401.

It is an arithmetic number, because the mean of its divisors is an integer number (3697998).

Almost surely, 2^22131591 is an apocalyptic number.

22131591 is a deficient number, since it is larger than the sum of its proper divisors (7452393).

22131591 is a wasteful number, since it uses less digits than its factorization.

22131591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18801.

The product of its digits is 540, while the sum is 24.

The square root of 22131591 is about 4704.4224937818. The cubic root of 22131591 is about 280.7614943223.

It can be divided in two parts, 22131 and 591, that added together give a palindrome (22722).

The spelling of 22131591 in words is "twenty-two million, one hundred thirty-one thousand, five hundred ninety-one".