204022391 has 2 divisors, whose sum is σ = 204022392. Its totient is φ = 204022390.

The previous prime is 204022367. The next prime is 204022409. The reversal of 204022391 is 193220402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204022391 - 2¹⁸ = 203760247 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 (204022691) 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, 102011195 + 102011196.

It is an arithmetic number, because the mean of its divisors is an integer number (102011196).

Almost surely, 2^204022391 is an apocalyptic number.

204022391 is a deficient number, since it is larger than the sum of its proper divisors (1).

204022391 is an equidigital number, since it uses as much as digits as its factorization.

204022391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 204022391 is about 14283.6406773623. The cubic root of 204022391 is about 588.6980685740.

Adding to 204022391 its reverse (193220402), we get a palindrome (397242793).

The spelling of 204022391 in words is "two hundred four million, twenty-two thousand, three hundred ninety-one".