91646749 has 2 divisors, whose sum is σ = 91646750. Its totient is φ = 91646748.

The previous prime is 91646741. The next prime is 91646759. The reversal of 91646749 is 94764619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61121124 + 30525625 = 7818^2 + 5525^2 .

It is a cyclic number.

It is not a de Polignac number, because 91646749 - 2³ = 91646741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91646699 and 91646708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91646741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45823374 + 45823375.

It is an arithmetic number, because the mean of its divisors is an integer number (45823375).

Almost surely, 2^91646749 is an apocalyptic number.

It is an amenable number.

91646749 is a deficient number, since it is larger than the sum of its proper divisors (1).

91646749 is an equidigital number, since it uses as much as digits as its factorization.

91646749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 91646749 is about 9573.2308548368. The cubic root of 91646749 is about 450.8572121367.

The spelling of 91646749 in words is "ninety-one million, six hundred forty-six thousand, seven hundred forty-nine".