22391881 has 4 divisors (see below), whose sum is σ = 22868352. Its totient is φ = 21915412.

The previous prime is 22391867. The next prime is 22391893. The reversal of 22391881 is 18819322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18819322 = 2 ⋅9409661.

It is a cyclic number.

It is not a de Polignac number, because 22391881 - 2⁷ = 22391753 is a prime.

It is a super-2 number, since 2×22391881² = 1002792669436322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22391821) 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, 238165 + ... + 238258.

It is an arithmetic number, because the mean of its divisors is an integer number (5717088).

Almost surely, 2^22391881 is an apocalyptic number.

It is an amenable number.

22391881 is a deficient number, since it is larger than the sum of its proper divisors (476471).

22391881 is an equidigital number, since it uses as much as digits as its factorization.

22391881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476470.

The product of its digits is 6912, while the sum is 34.

The square root of 22391881 is about 4732.0060228195. The cubic root of 22391881 is about 281.8578874179.

The spelling of 22391881 in words is "twenty-two million, three hundred ninety-one thousand, eight hundred eighty-one".