22391131 has 4 divisors (see below), whose sum is σ = 25589872. Its totient is φ = 19192392.

The previous prime is 22391119. The next prime is 22391137. The reversal of 22391131 is 13119322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13119322 = 2 ⋅6559661.

It is a cyclic number.

It is not a de Polignac number, because 22391131 - 2⁵ = 22391099 is a prime.

It is a super-2 number, since 2×22391131² = 1002725494918322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22391137) 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, 1599360 + ... + 1599373.

It is an arithmetic number, because the mean of its divisors is an integer number (6397468).

Almost surely, 2^22391131 is an apocalyptic number.

22391131 is a deficient number, since it is larger than the sum of its proper divisors (3198741).

22391131 is an equidigital number, since it uses as much as digits as its factorization.

22391131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198740.

The product of its digits is 324, while the sum is 22.

The square root of 22391131 is about 4731.9267745814. The cubic root of 22391131 is about 281.8547405068.

It can be divided in two parts, 22391 and 131, that added together give a palindrome (22522).

The spelling of 22391131 in words is "twenty-two million, three hundred ninety-one thousand, one hundred thirty-one".