90391017 has 4 divisors (see below), whose sum is σ = 120521360. Its totient is φ = 60260676.

The previous prime is 90390997. The next prime is 90391051. The reversal of 90391017 is 71019309.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71019309 = 3 ⋅23673103.

It is not a de Polignac number, because 90391017 - 2¹⁹ = 89866729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90391087) 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 in 3 ways as a sum of consecutive naturals, for example, 15065167 + ... + 15065172.

It is an arithmetic number, because the mean of its divisors is an integer number (30130340).

Almost surely, 2^90391017 is an apocalyptic number.

It is an amenable number.

90391017 is a deficient number, since it is larger than the sum of its proper divisors (30130343).

90391017 is a wasteful number, since it uses less digits than its factorization.

90391017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30130342.

The product of its (nonzero) digits is 1701, while the sum is 30.

The square root of 90391017 is about 9507.4190504048. The cubic root of 90391017 is about 448.7885390406.

The spelling of 90391017 in words is "ninety million, three hundred ninety-one thousand, seventeen".