90587993 has 2 divisors, whose sum is σ = 90587994. Its totient is φ = 90587992.

The previous prime is 90587947. The next prime is 90588013. The reversal of 90587993 is 39978509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89340304 + 1247689 = 9452^2 + 1117^2 .

It is a cyclic number.

It is not a de Polignac number, because 90587993 - 2⁶ = 90587929 is a prime.

It is not a weakly prime, because it can be changed into another prime (90587923) 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, 45293996 + 45293997.

It is an arithmetic number, because the mean of its divisors is an integer number (45293997).

Almost surely, 2^90587993 is an apocalyptic number.

It is an amenable number.

90587993 is a deficient number, since it is larger than the sum of its proper divisors (1).

90587993 is an equidigital number, since it uses as much as digits as its factorization.

90587993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 90587993 is about 9517.7724809958. The cubic root of 90587993 is about 449.1142957326.

The spelling of 90587993 in words is "ninety million, five hundred eighty-seven thousand, nine hundred ninety-three".