7791121287 has 6 divisors (see below), whose sum is σ = 11253841872. Its totient is φ = 5194080852.

The previous prime is 7791121249. The next prime is 7791121381. The reversal of 7791121287 is 7821211977.

It is not a de Polignac number, because 7791121287 - 2¹¹ = 7791119239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7791120287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432840063 + ... + 432840080.

It is an arithmetic number, because the mean of its divisors is an integer number (1875640312).

Almost surely, 2^7791121287 is an apocalyptic number.

7791121287 is a deficient number, since it is larger than the sum of its proper divisors (3462720585).

7791121287 is a wasteful number, since it uses less digits than its factorization.

7791121287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865680149 (or 865680146 counting only the distinct ones).

The product of its digits is 98784, while the sum is 45.

The square root of 7791121287 is about 88267.3285366675. The cubic root of 7791121287 is about 1982.4397099362.

The spelling of 7791121287 in words is "seven billion, seven hundred ninety-one million, one hundred twenty-one thousand, two hundred eighty-seven".