204280991 has 2 divisors, whose sum is σ = 204280992. Its totient is φ = 204280990.

The previous prime is 204280981. The next prime is 204281023. The reversal of 204280991 is 199082402.

204280991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204280991 - 2⁶ = 204280927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204280961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102140495 + 102140496.

It is an arithmetic number, because the mean of its divisors is an integer number (102140496).

Almost surely, 2^204280991 is an apocalyptic number.

204280991 is a deficient number, since it is larger than the sum of its proper divisors (1).

204280991 is an equidigital number, since it uses as much as digits as its factorization.

204280991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 204280991 is about 14292.6901246756. The cubic root of 204280991 is about 588.9466900518.

The spelling of 204280991 in words is "two hundred four million, two hundred eighty thousand, nine hundred ninety-one".