90331873 has 2 divisors, whose sum is σ = 90331874. Its totient is φ = 90331872.

The previous prime is 90331853. The next prime is 90331883. The reversal of 90331873 is 37813309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89718784 + 613089 = 9472^2 + 783^2 .

It is a cyclic number.

It is not a de Polignac number, because 90331873 - 2¹⁷ = 90200801 is a prime.

It is not a weakly prime, because it can be changed into another prime (90331823) 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, 45165936 + 45165937.

It is an arithmetic number, because the mean of its divisors is an integer number (45165937).

Almost surely, 2^90331873 is an apocalyptic number.

It is an amenable number.

90331873 is a deficient number, since it is larger than the sum of its proper divisors (1).

90331873 is an equidigital number, since it uses as much as digits as its factorization.

90331873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 90331873 is about 9504.3081284226. The cubic root of 90331873 is about 448.6906349880.

It can be divided in two parts, 90331 and 873, that added together give a square (91204 = 302²).

The spelling of 90331873 in words is "ninety million, three hundred thirty-one thousand, eight hundred seventy-three".