90813143294813 has 2 divisors, whose sum is σ = 90813143294814. Its totient is φ = 90813143294812.

The previous prime is 90813143294773. The next prime is 90813143294831. The reversal of 90813143294813 is 31849234131809.

It is a happy number.

Together with next prime (90813143294831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87718172176804 + 3094971118009 = 9365798^2 + 1759253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90813143294813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90813143294513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45406571647406 + 45406571647407.

It is an arithmetic number, because the mean of its divisors is an integer number (45406571647407).

Almost surely, 2^{90813143294813} is an apocalyptic number.

It is an amenable number.

90813143294813 is a deficient number, since it is larger than the sum of its proper divisors (1).

90813143294813 is an equidigital number, since it uses as much as digits as its factorization.

90813143294813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 90813143294813 in words is "ninety trillion, eight hundred thirteen billion, one hundred forty-three million, two hundred ninety-four thousand, eight hundred thirteen".