91748773 has 2 divisors, whose sum is σ = 91748774. Its totient is φ = 91748772.

The previous prime is 91748753. The next prime is 91748791. The reversal of 91748773 is 37784719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77141089 + 14607684 = 8783^2 + 3822^2 .

It is a cyclic number.

It is not a de Polignac number, because 91748773 - 2¹³ = 91740581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91748753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45874386 + 45874387.

It is an arithmetic number, because the mean of its divisors is an integer number (45874387).

Almost surely, 2^91748773 is an apocalyptic number.

It is an amenable number.

91748773 is a deficient number, since it is larger than the sum of its proper divisors (1).

91748773 is an equidigital number, since it uses as much as digits as its factorization.

91748773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 46.

The square root of 91748773 is about 9578.5579812412. The cubic root of 91748773 is about 451.0244528312.

The spelling of 91748773 in words is "ninety-one million, seven hundred forty-eight thousand, seven hundred seventy-three".