91601863 has 2 divisors, whose sum is σ = 91601864. Its totient is φ = 91601862.

The previous prime is 91601821. The next prime is 91601897. The reversal of 91601863 is 36810619.

It is an a-pointer prime, because the next prime (91601897) can be obtained adding 91601863 to its sum of digits (34).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91601863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91601803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45800931 + 45800932.

It is an arithmetic number, because the mean of its divisors is an integer number (45800932).

Almost surely, 2^91601863 is an apocalyptic number.

91601863 is a deficient number, since it is larger than the sum of its proper divisors (1).

91601863 is an equidigital number, since it uses as much as digits as its factorization.

91601863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 91601863 is about 9570.8862181096. The cubic root of 91601863 is about 450.7835943895.

The spelling of 91601863 in words is "ninety-one million, six hundred one thousand, eight hundred sixty-three".