9121915687 has 2 divisors, whose sum is σ = 9121915688. Its totient is φ = 9121915686.

The previous prime is 9121915643. The next prime is 9121915703. The reversal of 9121915687 is 7865191219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9121915687 - 2²⁷ = 8987697959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9121915687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9121910687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4560957843 + 4560957844.

It is an arithmetic number, because the mean of its divisors is an integer number (4560957844).

Almost surely, 2^9121915687 is an apocalyptic number.

9121915687 is a deficient number, since it is larger than the sum of its proper divisors (1).

9121915687 is an equidigital number, since it uses as much as digits as its factorization.

9121915687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 49.

The square root of 9121915687 is about 95508.7204761953. The cubic root of 9121915687 is about 2089.4341307416.

The spelling of 9121915687 in words is "nine billion, one hundred twenty-one million, nine hundred fifteen thousand, six hundred eighty-seven".