90413383515821 has 2 divisors, whose sum is σ = 90413383515822. Its totient is φ = 90413383515820.

The previous prime is 90413383515799. The next prime is 90413383515913. The reversal of 90413383515821 is 12851538331409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82736106291721 + 7677277224100 = 9095939^2 + 2770790^2 .

It is a cyclic number.

It is not a de Polignac number, because 90413383515821 - 2⁶ = 90413383515757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90413383512821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45206691757910 + 45206691757911.

It is an arithmetic number, because the mean of its divisors is an integer number (45206691757911).

Almost surely, 2^{90413383515821} is an apocalyptic number.

It is an amenable number.

90413383515821 is a deficient number, since it is larger than the sum of its proper divisors (1).

90413383515821 is an equidigital number, since it uses as much as digits as its factorization.

90413383515821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 90413383515821 in words is "ninety trillion, four hundred thirteen billion, three hundred eighty-three million, five hundred fifteen thousand, eight hundred twenty-one".