91074861 has 30 divisors (see below), whose sum is σ = 139279470. Its totient is φ = 59307984.

The previous prime is 91074853. The next prime is 91074881. The reversal of 91074861 is 16847019.

It can be written as a sum of positive squares in only one way, i.e., 86601636 + 4473225 = 9306^2 + 2115^2 .

It is not a de Polignac number, because 91074861 - 2³ = 91074853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91074881) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 178675 + ... + 179183.

It is an arithmetic number, because the mean of its divisors is an integer number (4642649).

Almost surely, 2^91074861 is an apocalyptic number.

It is an amenable number.

91074861 is a deficient number, since it is larger than the sum of its proper divisors (48204609).

91074861 is an equidigital number, since it uses as much as digits as its factorization.

91074861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 559 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 91074861 is about 9543.3149900860. The cubic root of 91074861 is about 449.9174515248.

The spelling of 91074861 in words is "ninety-one million, seventy-four thousand, eight hundred sixty-one".