22081961 has 4 divisors (see below), whose sum is σ = 24089424. Its totient is φ = 20074500.

The previous prime is 22081931. The next prime is 22081967. The reversal of 22081961 is 16918022.

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.

It is a cyclic number.

It is not a de Polignac number, because 22081961 - 2⁶ = 22081897 is a prime.

It is a super-2 number, since 2×22081961² = 975226003211042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22081967) 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, 1003715 + ... + 1003736.

It is an arithmetic number, because the mean of its divisors is an integer number (6022356).

Almost surely, 2^22081961 is an apocalyptic number.

It is an amenable number.

22081961 is a deficient number, since it is larger than the sum of its proper divisors (2007463).

22081961 is a wasteful number, since it uses less digits than its factorization.

22081961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007462.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 22081961 is about 4699.1447094126. The cubic root of 22081961 is about 280.5514684254.

Adding to 22081961 its reverse (16918022), we get a palindrome (38999983).

The spelling of 22081961 in words is "twenty-two million, eighty-one thousand, nine hundred sixty-one".