2191258897 has 8 divisors (see below), whose sum is σ = 2229346152. Its totient is φ = 2153241600.

The previous prime is 2191258873. The next prime is 2191258903. The reversal of 2191258897 is 7988521912.

It can be written as a sum of positive squares in 4 ways, for example, as 615486481 + 1575772416 = 24809^2 + 39696^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2191258897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2191258297) 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, 47793 + ... + 81649.

It is an arithmetic number, because the mean of its divisors is an integer number (278668269).

Almost surely, 2^2191258897 is an apocalyptic number.

It is an amenable number.

2191258897 is a deficient number, since it is larger than the sum of its proper divisors (38087255).

2191258897 is a wasteful number, since it uses less digits than its factorization.

2191258897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34979.

The product of its digits is 725760, while the sum is 52.

The square root of 2191258897 is about 46810.8843860058. The cubic root of 2191258897 is about 1298.8666447591.

The spelling of 2191258897 in words is "two billion, one hundred ninety-one million, two hundred fifty-eight thousand, eight hundred ninety-seven".