90046305781 has 2 divisors, whose sum is σ = 90046305782. Its totient is φ = 90046305780.

The previous prime is 90046305751. The next prime is 90046305787. The reversal of 90046305781 is 18750364009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88070058756 + 1976247025 = 296766^2 + 44455^2 .

It is a cyclic number.

It is not a de Polignac number, because 90046305781 - 2⁹ = 90046305269 is a prime.

It is a super-2 number, since 2×90046305781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90046305787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45023152890 + 45023152891.

It is an arithmetic number, because the mean of its divisors is an integer number (45023152891).

Almost surely, 2^90046305781 is an apocalyptic number.

It is an amenable number.

90046305781 is a deficient number, since it is larger than the sum of its proper divisors (1).

90046305781 is an equidigital number, since it uses as much as digits as its factorization.

90046305781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 90046305781 in words is "ninety billion, forty-six million, three hundred five thousand, seven hundred eighty-one".