90154548946789 has 2 divisors, whose sum is σ = 90154548946790. Its totient is φ = 90154548946788.

The previous prime is 90154548946747. The next prime is 90154548946793. The reversal of 90154548946789 is 98764984545109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89653344417025 + 501204529764 = 9468545^2 + 707958^2 .

It is a cyclic number.

It is not a de Polignac number, because 90154548946789 - 2⁹ = 90154548946277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90154548946489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45077274473394 + 45077274473395.

It is an arithmetic number, because the mean of its divisors is an integer number (45077274473395).

Almost surely, 2^{90154548946789} is an apocalyptic number.

It is an amenable number.

90154548946789 is a deficient number, since it is larger than the sum of its proper divisors (1).

90154548946789 is an equidigital number, since it uses as much as digits as its factorization.

90154548946789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3135283200, while the sum is 79.

The spelling of 90154548946789 in words is "ninety trillion, one hundred fifty-four billion, five hundred forty-eight million, nine hundred forty-six thousand, seven hundred eighty-nine".