22061891 has 2 divisors, whose sum is σ = 22061892. Its totient is φ = 22061890.

The previous prime is 22061873. The next prime is 22061911. The reversal of 22061891 is 19816022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22061891 - 2¹⁸ = 21799747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22061821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11030945 + 11030946.

It is an arithmetic number, because the mean of its divisors is an integer number (11030946).

Almost surely, 2^22061891 is an apocalyptic number.

22061891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22061891 is an equidigital number, since it uses as much as digits as its factorization.

22061891 is an evil number, because the sum of its binary digits is even.

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

The square root of 22061891 is about 4697.0087289678. The cubic root of 22061891 is about 280.4664461650.

The spelling of 22061891 in words is "twenty-two million, sixty-one thousand, eight hundred ninety-one".