91603559 has 2 divisors, whose sum is σ = 91603560. Its totient is φ = 91603558.

The previous prime is 91603529. The next prime is 91603571. The reversal of 91603559 is 95530619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91603559 - 2¹² = 91599463 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91603529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45801779 + 45801780.

It is an arithmetic number, because the mean of its divisors is an integer number (45801780).

Almost surely, 2^91603559 is an apocalyptic number.

91603559 is a deficient number, since it is larger than the sum of its proper divisors (1).

91603559 is an equidigital number, since it uses as much as digits as its factorization.

91603559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 91603559 is about 9570.9748197349. The cubic root of 91603559 is about 450.7863764445.

The spelling of 91603559 in words is "ninety-one million, six hundred three thousand, five hundred fifty-nine".