204631891 has 2 divisors, whose sum is σ = 204631892. Its totient is φ = 204631890.

The previous prime is 204631877. The next prime is 204631901. The reversal of 204631891 is 198136402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204631891 - 2⁹ = 204631379 is a prime.

It is not a weakly prime, because it can be changed into another prime (204631841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102315945 + 102315946.

It is an arithmetic number, because the mean of its divisors is an integer number (102315946).

Almost surely, 2^204631891 is an apocalyptic number.

204631891 is a deficient number, since it is larger than the sum of its proper divisors (1).

204631891 is an equidigital number, since it uses as much as digits as its factorization.

204631891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 204631891 is about 14304.9603634543. The cubic root of 204631891 is about 589.2837146826.

The spelling of 204631891 in words is "two hundred four million, six hundred thirty-one thousand, eight hundred ninety-one".