19090997 has 2 divisors, whose sum is σ = 19090998. Its totient is φ = 19090996.

The previous prime is 19090979. The next prime is 19090999. The reversal of 19090997 is 79909091.

Together with previous prime (19090979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17926756 + 1164241 = 4234^2 + 1079^2 .

It is a cyclic number.

It is not a de Polignac number, because 19090997 - 2⁶ = 19090933 is a prime.

Together with 19090999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19090999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9545498 + 9545499.

It is an arithmetic number, because the mean of its divisors is an integer number (9545499).

Almost surely, 2^19090997 is an apocalyptic number.

It is an amenable number.

19090997 is a deficient number, since it is larger than the sum of its proper divisors (1).

19090997 is an equidigital number, since it uses as much as digits as its factorization.

19090997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 19090997 is about 4369.3245473414. The cubic root of 19090997 is about 267.2654805411.

The spelling of 19090997 in words is "nineteen million, ninety thousand, nine hundred ninety-seven".