91680291 has 6 divisors (see below), whose sum is σ = 132427100. Its totient is φ = 61120188.

The previous prime is 91680289. The next prime is 91680293. The reversal of 91680291 is 19208619.

It is an interprime number because it is at equal distance from previous prime (91680289) and next prime (91680293).

It is not a de Polignac number, because 91680291 - 2¹ = 91680289 is a prime.

It is a super-3 number, since 3×91680291³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91680293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5093341 + ... + 5093358.

Almost surely, 2^91680291 is an apocalyptic number.

91680291 is a deficient number, since it is larger than the sum of its proper divisors (40746809).

91680291 is a wasteful number, since it uses less digits than its factorization.

91680291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10186705 (or 10186702 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 91680291 is about 9574.9825587309. The cubic root of 91680291 is about 450.9122088432.

The spelling of 91680291 in words is "ninety-one million, six hundred eighty thousand, two hundred ninety-one".