22191901 has 2 divisors, whose sum is σ = 22191902. Its totient is φ = 22191900.

The previous prime is 22191893. The next prime is 22191937. The reversal of 22191901 is 10919122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 4120900 = 4251^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 22191901 - 2³ = 22191893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22191991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11095950 + 11095951.

It is an arithmetic number, because the mean of its divisors is an integer number (11095951).

Almost surely, 2^22191901 is an apocalyptic number.

It is an amenable number.

22191901 is a deficient number, since it is larger than the sum of its proper divisors (1).

22191901 is an equidigital number, since it uses as much as digits as its factorization.

22191901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 22191901 is about 4710.8280588449. The cubic root of 22191901 is about 281.0162940193.

The spelling of 22191901 in words is "twenty-two million, one hundred ninety-one thousand, nine hundred one".