205053691 has 2 divisors, whose sum is σ = 205053692. Its totient is φ = 205053690.

The previous prime is 205053689. The next prime is 205053703. The reversal of 205053691 is 196350502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205053691 - 2¹ = 205053689 is a prime.

Together with 205053689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (205053091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102526845 + 102526846.

It is an arithmetic number, because the mean of its divisors is an integer number (102526846).

Almost surely, 2^205053691 is an apocalyptic number.

205053691 is a deficient number, since it is larger than the sum of its proper divisors (1).

205053691 is an equidigital number, since it uses as much as digits as its factorization.

205053691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 205053691 is about 14319.6959115758. The cubic root of 205053691 is about 589.6883262391.

The spelling of 205053691 in words is "two hundred five million, fifty-three thousand, six hundred ninety-one".