89990561 has 2 divisors, whose sum is σ = 89990562. Its totient is φ = 89990560.

The previous prime is 89990543. The next prime is 89990573. The reversal of 89990561 is 16509998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61528336 + 28462225 = 7844^2 + 5335^2 .

It is a cyclic number.

It is not a de Polignac number, because 89990561 - 2²² = 85796257 is a prime.

It is not a weakly prime, because it can be changed into another prime (89990501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44995280 + 44995281.

It is an arithmetic number, because the mean of its divisors is an integer number (44995281).

Almost surely, 2^89990561 is an apocalyptic number.

It is an amenable number.

89990561 is a deficient number, since it is larger than the sum of its proper divisors (1).

89990561 is an equidigital number, since it uses as much as digits as its factorization.

89990561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 89990561 is about 9486.3354884803. The cubic root of 89990561 is about 448.1248074490.

The spelling of 89990561 in words is "eighty-nine million, nine hundred ninety thousand, five hundred sixty-one".