19922197 has 2 divisors, whose sum is σ = 19922198. Its totient is φ = 19922196.

The previous prime is 19922179. The next prime is 19922233. The reversal of 19922197 is 79122991.

It is a happy number.

Together with previous prime (19922179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19131876 + 790321 = 4374^2 + 889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19922197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19922107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9961098 + 9961099.

It is an arithmetic number, because the mean of its divisors is an integer number (9961099).

Almost surely, 2^19922197 is an apocalyptic number.

It is an amenable number.

19922197 is a deficient number, since it is larger than the sum of its proper divisors (1).

19922197 is an equidigital number, since it uses as much as digits as its factorization.

19922197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 40.

The square root of 19922197 is about 4463.4288389085. The cubic root of 19922197 is about 271.0893211918.

The spelling of 19922197 in words is "nineteen million, nine hundred twenty-two thousand, one hundred ninety-seven".