91740491 has 4 divisors (see below), whose sum is σ = 95729232. Its totient is φ = 87751752.

The previous prime is 91740463. The next prime is 91740527. The reversal of 91740491 is 19404719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19404719 = 19 ⋅1021301.

It is a cyclic number.

It is not a de Polignac number, because 91740491 - 2¹⁴ = 91724107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91740431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994336 + ... + 1994381.

It is an arithmetic number, because the mean of its divisors is an integer number (23932308).

Almost surely, 2^91740491 is an apocalyptic number.

91740491 is a deficient number, since it is larger than the sum of its proper divisors (3988741).

91740491 is a wasteful number, since it uses less digits than its factorization.

91740491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988740.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 91740491 is about 9578.1256517129. The cubic root of 91740491 is about 451.0108813621.

The spelling of 91740491 in words is "ninety-one million, seven hundred forty thousand, four hundred ninety-one".