91140681 has 8 divisors (see below), whose sum is σ = 121994784. Its totient is φ = 60523520.

The previous prime is 91140667. The next prime is 91140733. The reversal of 91140681 is 18604119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91140681 - 2¹¹ = 91138633 is a prime.

It is a super-2 number, since 2×91140681² = 16613247466287522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91140601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58335 + ... + 59876.

It is an arithmetic number, because the mean of its divisors is an integer number (15249348).

Almost surely, 2^91140681 is an apocalyptic number.

It is an amenable number.

91140681 is a deficient number, since it is larger than the sum of its proper divisors (30854103).

91140681 is a wasteful number, since it uses less digits than its factorization.

91140681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118471.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 91140681 is about 9546.7628544968. The cubic root of 91140681 is about 450.0258108652.

The spelling of 91140681 in words is "ninety-one million, one hundred forty thousand, six hundred eighty-one".