90821931203441 has 2 divisors, whose sum is σ = 90821931203442. Its totient is φ = 90821931203440.

The previous prime is 90821931203287. The next prime is 90821931203447. The reversal of 90821931203441 is 14430213912809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55627790227216 + 35194140976225 = 7458404^2 + 5932465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90821931203441 is a prime.

It is not a weakly prime, because it can be changed into another prime (90821931203447) 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, 45410965601720 + 45410965601721.

It is an arithmetic number, because the mean of its divisors is an integer number (45410965601721).

Almost surely, 2^{90821931203441} is an apocalyptic number.

It is an amenable number.

90821931203441 is a deficient number, since it is larger than the sum of its proper divisors (1).

90821931203441 is an equidigital number, since it uses as much as digits as its factorization.

90821931203441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 90821931203441 in words is "ninety trillion, eight hundred twenty-one billion, nine hundred thirty-one million, two hundred three thousand, four hundred forty-one".