19128997 has 2 divisors, whose sum is σ = 19128998. Its totient is φ = 19128996.

The previous prime is 19128983. The next prime is 19129003. The reversal of 19128997 is 79982191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 690561 = 4294^2 + 831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19128997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19128397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9564498 + 9564499.

It is an arithmetic number, because the mean of its divisors is an integer number (9564499).

Almost surely, 2^19128997 is an apocalyptic number.

It is an amenable number.

19128997 is a deficient number, since it is larger than the sum of its proper divisors (1).

19128997 is an equidigital number, since it uses as much as digits as its factorization.

19128997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 46.

The square root of 19128997 is about 4373.6708838229. The cubic root of 19128997 is about 267.4426907246.

The spelling of 19128997 in words is "nineteen million, one hundred twenty-eight thousand, nine hundred ninety-seven".