90821611 has 2 divisors, whose sum is σ = 90821612. Its totient is φ = 90821610.

The previous prime is 90821597. The next prime is 90821659. The reversal of 90821611 is 11612809.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90821611 - 2⁵ = 90821579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90821611.

It is not a weakly prime, because it can be changed into another prime (90821711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45410805 + 45410806.

It is an arithmetic number, because the mean of its divisors is an integer number (45410806).

Almost surely, 2^90821611 is an apocalyptic number.

90821611 is a deficient number, since it is larger than the sum of its proper divisors (1).

90821611 is an equidigital number, since it uses as much as digits as its factorization.

90821611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 90821611 is about 9530.0373031799. The cubic root of 90821611 is about 449.5000389754.

The spelling of 90821611 in words is "ninety million, eight hundred twenty-one thousand, six hundred eleven".