90689449 has 2 divisors, whose sum is σ = 90689450. Its totient is φ = 90689448.

The previous prime is 90689411. The next prime is 90689531. The reversal of 90689449 is 94498609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90630400 + 59049 = 9520^2 + 243^2 .

It is a cyclic number.

It is not a de Polignac number, because 90689449 - 2¹⁵ = 90656681 is a prime.

It is not a weakly prime, because it can be changed into another prime (90689149) 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, 45344724 + 45344725.

It is an arithmetic number, because the mean of its divisors is an integer number (45344725).

Almost surely, 2^90689449 is an apocalyptic number.

It is an amenable number.

90689449 is a deficient number, since it is larger than the sum of its proper divisors (1).

90689449 is an equidigital number, since it uses as much as digits as its factorization.

90689449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 90689449 is about 9523.1008080352. The cubic root of 90689449 is about 449.2818982975.

The spelling of 90689449 in words is "ninety million, six hundred eighty-nine thousand, four hundred forty-nine".