8991851249 has 2 divisors, whose sum is σ = 8991851250. Its totient is φ = 8991851248.

The previous prime is 8991851207. The next prime is 8991851257. The reversal of 8991851249 is 9421581998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7113235600 + 1878615649 = 84340^2 + 43343^2 .

It is a cyclic number.

It is not a de Polignac number, because 8991851249 - 2¹⁶ = 8991785713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8991851194 and 8991851203.

It is not a weakly prime, because it can be changed into another prime (8991851549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4495925624 + 4495925625.

It is an arithmetic number, because the mean of its divisors is an integer number (4495925625).

Almost surely, 2^8991851249 is an apocalyptic number.

It is an amenable number.

8991851249 is a deficient number, since it is larger than the sum of its proper divisors (1).

8991851249 is an equidigital number, since it uses as much as digits as its factorization.

8991851249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 56.

The square root of 8991851249 is about 94825.3723905158. The cubic root of 8991851249 is about 2079.4558525579.

The spelling of 8991851249 in words is "eight billion, nine hundred ninety-one million, eight hundred fifty-one thousand, two hundred forty-nine".