8791121287 has 16 divisors (see below), whose sum is σ = 9612298080. Its totient is φ = 7991004672.

The previous prime is 8791121279. The next prime is 8791121291. The reversal of 8791121287 is 7821211978.

It is a cyclic number.

It is not a de Polignac number, because 8791121287 - 2³ = 8791121279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8791127287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 618363 + ... + 632419.

It is an arithmetic number, because the mean of its divisors is an integer number (600768630).

Almost surely, 2^8791121287 is an apocalyptic number.

8791121287 is a deficient number, since it is larger than the sum of its proper divisors (821176793).

8791121287 is a wasteful number, since it uses less digits than its factorization.

8791121287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14802.

The product of its digits is 112896, while the sum is 46.

The square root of 8791121287 is about 93760.9795543967. The cubic root of 8791121287 is about 2063.8656549246.

The spelling of 8791121287 in words is "eight billion, seven hundred ninety-one million, one hundred twenty-one thousand, two hundred eighty-seven".