91293493 has 2 divisors, whose sum is σ = 91293494. Its totient is φ = 91293492.

The previous prime is 91293487. The next prime is 91293497. The reversal of 91293493 is 39439219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82755409 + 8538084 = 9097^2 + 2922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91293493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91293497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45646746 + 45646747.

It is an arithmetic number, because the mean of its divisors is an integer number (45646747).

Almost surely, 2^91293493 is an apocalyptic number.

It is an amenable number.

91293493 is a deficient number, since it is larger than the sum of its proper divisors (1).

91293493 is an equidigital number, since it uses as much as digits as its factorization.

91293493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 40.

The square root of 91293493 is about 9554.7628437340. The cubic root of 91293493 is about 450.2771839620.

The spelling of 91293493 in words is "ninety-one million, two hundred ninety-three thousand, four hundred ninety-three".