9121778023 has 2 divisors, whose sum is σ = 9121778024. Its totient is φ = 9121778022.

The previous prime is 9121778021. The next prime is 9121778051. The reversal of 9121778023 is 3208771219.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9121778023 - 2¹ = 9121778021 is a prime.

Together with 9121778021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9121778021) 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, 4560889011 + 4560889012.

It is an arithmetic number, because the mean of its divisors is an integer number (4560889012).

Almost surely, 2^9121778023 is an apocalyptic number.

9121778023 is a deficient number, since it is larger than the sum of its proper divisors (1).

9121778023 is an equidigital number, since it uses as much as digits as its factorization.

9121778023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 9121778023 is about 95507.9997853583. Note that the first 3 decimals coincide. The cubic root of 9121778023 is about 2089.4236197438.

The spelling of 9121778023 in words is "nine billion, one hundred twenty-one million, seven hundred seventy-eight thousand, twenty-three".