204013591 has 2 divisors, whose sum is σ = 204013592. Its totient is φ = 204013590.

The previous prime is 204013577. The next prime is 204013603. The reversal of 204013591 is 195310402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204013591 - 2⁵ = 204013559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204013501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102006795 + 102006796.

It is an arithmetic number, because the mean of its divisors is an integer number (102006796).

Almost surely, 2^204013591 is an apocalyptic number.

204013591 is a deficient number, since it is larger than the sum of its proper divisors (1).

204013591 is an equidigital number, since it uses as much as digits as its factorization.

204013591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 204013591 is about 14283.3326293271. The cubic root of 204013591 is about 588.6896044417.

Adding to 204013591 its reverse (195310402), we get a palindrome (399323993).

The spelling of 204013591 in words is "two hundred four million, thirteen thousand, five hundred ninety-one".