204615091 has 2 divisors, whose sum is σ = 204615092. Its totient is φ = 204615090.

The previous prime is 204615013. The next prime is 204615101. The reversal of 204615091 is 190516402.

204615091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204615091 - 2¹⁷ = 204484019 is a prime.

It is not a weakly prime, because it can be changed into another prime (204613091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102307545 + 102307546.

It is an arithmetic number, because the mean of its divisors is an integer number (102307546).

Almost surely, 2^204615091 is an apocalyptic number.

204615091 is a deficient number, since it is larger than the sum of its proper divisors (1).

204615091 is an equidigital number, since it uses as much as digits as its factorization.

204615091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 204615091 is about 14304.3731425044. The cubic root of 204615091 is about 589.2675877774.

It can be divided in two parts, 20461 and 5091, that added together give a palindrome (25552).

The spelling of 204615091 in words is "two hundred four million, six hundred fifteen thousand, ninety-one".