2291747985 has 80 divisors (see below), whose sum is σ = 4579027200. Its totient is φ = 1089759744.

The previous prime is 2291747981. The next prime is 2291747993. The reversal of 2291747985 is 5897471922.

2291747985 is a `hidden beast` number, since 2 + 2 + 91 + 7 + 479 + 85 = 666.

It is not a de Polignac number, because 2291747985 - 2² = 2291747981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2291747981) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 122056 + ... + 139574.

It is an arithmetic number, because the mean of its divisors is an integer number (57237840).

Almost surely, 2^2291747985 is an apocalyptic number.

It is an amenable number.

2291747985 is a deficient number, since it is larger than the sum of its proper divisors (2287279215).

2291747985 is a wasteful number, since it uses less digits than its factorization.

2291747985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17572 (or 17563 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 2291747985 is about 47872.2047225736. The cubic root of 2291747985 is about 1318.4255763728.

The spelling of 2291747985 in words is "two billion, two hundred ninety-one million, seven hundred forty-seven thousand, nine hundred eighty-five".