204579000991 has 2 divisors, whose sum is σ = 204579000992. Its totient is φ = 204579000990.

The previous prime is 204579000949. The next prime is 204579001049. The reversal of 204579000991 is 199000975402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204579000991 - 2¹³ = 204578992799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204579000911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102289500495 + 102289500496.

It is an arithmetic number, because the mean of its divisors is an integer number (102289500496).

Almost surely, 2^204579000991 is an apocalyptic number.

204579000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

204579000991 is an equidigital number, since it uses as much as digits as its factorization.

204579000991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 204579000991 in words is "two hundred four billion, five hundred seventy-nine million, nine hundred ninety-one", and thus it is an aban number.