90518513 has 2 divisors, whose sum is σ = 90518514. Its totient is φ = 90518512.

The previous prime is 90518479. The next prime is 90518531. The reversal of 90518513 is 31581509.

90518513 = 6727² + 6728².

Together with next prime (90518531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45265984 + 45252529 = 6728^2 + 6727^2 .

It is a cyclic number.

It is not a de Polignac number, because 90518513 - 2⁸ = 90518257 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90518513.

It is not a weakly prime, because it can be changed into another prime (90518573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45259256 + 45259257.

It is an arithmetic number, because the mean of its divisors is an integer number (45259257).

Almost surely, 2^90518513 is an apocalyptic number.

90518513 is the 6728-th centered square number.

It is an amenable number.

90518513 is a deficient number, since it is larger than the sum of its proper divisors (1).

90518513 is an equidigital number, since it uses as much as digits as its factorization.

90518513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 90518513 is about 9514.1217671417. The cubic root of 90518513 is about 448.9994444465. Note that the first 3 decimals are identical.

The spelling of 90518513 in words is "ninety million, five hundred eighteen thousand, five hundred thirteen".