90515393 has 4 divisors (see below), whose sum is σ = 90975060. Its totient is φ = 90055728.

The previous prime is 90515389. The next prime is 90515417. The reversal of 90515393 is 39351509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39351509 = 743 ⋅52963.

It can be written as a sum of positive squares in 2 ways, for example, as 88134544 + 2380849 = 9388^2 + 1543^2 .

It is a cyclic number.

It is not a de Polignac number, because 90515393 - 2² = 90515389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90515323) 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, 229538 + ... + 229931.

It is an arithmetic number, because the mean of its divisors is an integer number (22743765).

Almost surely, 2^90515393 is an apocalyptic number.

It is an amenable number.

90515393 is a deficient number, since it is larger than the sum of its proper divisors (459667).

90515393 is a wasteful number, since it uses less digits than its factorization.

90515393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459666.

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 90515393 is about 9513.9577989394. The cubic root of 90515393 is about 448.9942856699.

The spelling of 90515393 in words is "ninety million, five hundred fifteen thousand, three hundred ninety-three".