91140705 has 12 divisors (see below), whose sum is σ = 157977300. Its totient is φ = 48608352.

The previous prime is 91140667. The next prime is 91140733. The reversal of 91140705 is 50704119.

It can be written as a sum of positive squares in 2 ways, for example, as 62110161 + 29030544 = 7881^2 + 5388^2 .

It is not a de Polignac number, because 91140705 - 2⁸ = 91140449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1012630 + ... + 1012719.

It is an arithmetic number, because the mean of its divisors is an integer number (13164775).

Almost surely, 2^91140705 is an apocalyptic number.

It is an amenable number.

91140705 is a deficient number, since it is larger than the sum of its proper divisors (66836595).

91140705 is a wasteful number, since it uses less digits than its factorization.

91140705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025360 (or 2025357 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 91140705 is about 9546.7641114673. The cubic root of 91140705 is about 450.0258503668.

It can be divided in two parts, 911 and 40705, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 91140705 in words is "ninety-one million, one hundred forty thousand, seven hundred five".