19804231 has 2 divisors, whose sum is σ = 19804232. Its totient is φ = 19804230.

The previous prime is 19804223. The next prime is 19804237. The reversal of 19804231 is 13240891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19804231 - 2³ = 19804223 is a prime.

It is a super-2 number, since 2×19804231² = 784415131002722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19804231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19804237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9902115 + 9902116.

It is an arithmetic number, because the mean of its divisors is an integer number (9902116).

Almost surely, 2^19804231 is an apocalyptic number.

19804231 is a deficient number, since it is larger than the sum of its proper divisors (1).

19804231 is an equidigital number, since it uses as much as digits as its factorization.

19804231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 19804231 is about 4450.1944901319. The cubic root of 19804231 is about 270.5531913761.

The spelling of 19804231 in words is "nineteen million, eight hundred four thousand, two hundred thirty-one".