91710491 has 4 divisors (see below), whose sum is σ = 91772232. Its totient is φ = 91648752.

The previous prime is 91710469. The next prime is 91710503. The reversal of 91710491 is 19401719.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19401719 = 23 ⋅843553.

It is a cyclic number.

It is not a de Polignac number, because 91710491 - 2¹⁰ = 91709467 is a prime.

It is a super-2 number, since 2×91710491² = 16821628318922162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91710191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28586 + ... + 31631.

It is an arithmetic number, because the mean of its divisors is an integer number (22943058).

Almost surely, 2^91710491 is an apocalyptic number.

91710491 is a deficient number, since it is larger than the sum of its proper divisors (61741).

91710491 is a wasteful number, since it uses less digits than its factorization.

91710491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61740.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 91710491 is about 9576.5594552532. The cubic root of 91710491 is about 450.9617144079.

The spelling of 91710491 in words is "ninety-one million, seven hundred ten thousand, four hundred ninety-one".