8919871049 has 4 divisors (see below), whose sum is σ = 9444569364. Its totient is φ = 8395172736.

The previous prime is 8919871039. The next prime is 8919871061. The reversal of 8919871049 is 9401789198.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7483461049 + 1436410000 = 86507^2 + 37900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8919871049 is a prime.

It is a super-3 number, since 3×8919871049³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8919870985 and 8919871003.

It is not an unprimeable number, because it can be changed into a prime (8919871039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262349132 + ... + 262349165.

It is an arithmetic number, because the mean of its divisors is an integer number (2361142341).

Almost surely, 2^8919871049 is an apocalyptic number.

It is an amenable number.

8919871049 is a deficient number, since it is larger than the sum of its proper divisors (524698315).

8919871049 is a wasteful number, since it uses less digits than its factorization.

8919871049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524698314.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The square root of 8919871049 is about 94445.0689501575. The cubic root of 8919871049 is about 2073.8922658784.

The spelling of 8919871049 in words is "eight billion, nine hundred nineteen million, eight hundred seventy-one thousand, forty-nine".