91861673 has 2 divisors, whose sum is σ = 91861674. Its totient is φ = 91861672.

The previous prime is 91861577. The next prime is 91861687. The reversal of 91861673 is 37616819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56957209 + 34904464 = 7547^2 + 5908^2 .

It is an emirp because it is prime and its reverse (37616819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91861673 - 2²⁶ = 24752809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91861673.

It is not a weakly prime, because it can be changed into another prime (91861073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45930836 + 45930837.

It is an arithmetic number, because the mean of its divisors is an integer number (45930837).

Almost surely, 2^91861673 is an apocalyptic number.

It is an amenable number.

91861673 is a deficient number, since it is larger than the sum of its proper divisors (1).

91861673 is an equidigital number, since it uses as much as digits as its factorization.

91861673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 91861673 is about 9584.4495407926. The cubic root of 91861673 is about 451.2093773332.

The spelling of 91861673 in words is "ninety-one million, eight hundred sixty-one thousand, six hundred seventy-three".