9121778087 has 8 divisors (see below), whose sum is σ = 9160062336. Its totient is φ = 9083571552.

The previous prime is 9121778051. The next prime is 9121778101. The reversal of 9121778087 is 7808771219.

It is a happy number.

9121778087 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9121778087 - 2⁶ = 9121778023 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 (9121772087) 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 in 7 ways as a sum of consecutive naturals, for example, 222053 + ... + 259905.

It is an arithmetic number, because the mean of its divisors is an integer number (1145007792).

Almost surely, 2^9121778087 is an apocalyptic number.

9121778087 is a deficient number, since it is larger than the sum of its proper divisors (38284249).

9121778087 is a wasteful number, since it uses less digits than its factorization.

9121778087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38857.

The product of its (nonzero) digits is 395136, while the sum is 50.

The square root of 9121778087 is about 95508.0001204088. Note that the first 3 decimals coincide. The cubic root of 9121778087 is about 2089.4236246304.

The spelling of 9121778087 in words is "nine billion, one hundred twenty-one million, seven hundred seventy-eight thousand, eighty-seven".