19798451 has 2 divisors, whose sum is σ = 19798452. Its totient is φ = 19798450.

The previous prime is 19798439. The next prime is 19798459. The reversal of 19798451 is 15489791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19798451 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19798459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9899225 + 9899226.

It is an arithmetic number, because the mean of its divisors is an integer number (9899226).

Almost surely, 2^19798451 is an apocalyptic number.

19798451 is a deficient number, since it is larger than the sum of its proper divisors (1).

19798451 is an equidigital number, since it uses as much as digits as its factorization.

19798451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 19798451 is about 4449.5450329219. The cubic root of 19798451 is about 270.5268678831.

The spelling of 19798451 in words is "nineteen million, seven hundred ninety-eight thousand, four hundred fifty-one".