206113591 has 2 divisors, whose sum is σ = 206113592. Its totient is φ = 206113590.

The previous prime is 206113547. The next prime is 206113597. The reversal of 206113591 is 195311602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206113591 - 2¹⁷ = 205982519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206113597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103056795 + 103056796.

It is an arithmetic number, because the mean of its divisors is an integer number (103056796).

Almost surely, 2^206113591 is an apocalyptic number.

206113591 is a deficient number, since it is larger than the sum of its proper divisors (1).

206113591 is an equidigital number, since it uses as much as digits as its factorization.

206113591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 206113591 is about 14356.6566790461. The cubic root of 206113591 is about 590.7025920886.

The spelling of 206113591 in words is "two hundred six million, one hundred thirteen thousand, five hundred ninety-one".