90989513 has 2 divisors, whose sum is σ = 90989514. Its totient is φ = 90989512.

The previous prime is 90989471. The next prime is 90989527. The reversal of 90989513 is 31598909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69939769 + 21049744 = 8363^2 + 4588^2 .

It is an emirp because it is prime and its reverse (31598909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90989513 - 2¹⁸ = 90727369 is a prime.

It is not a weakly prime, because it can be changed into another prime (90989533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45494756 + 45494757.

It is an arithmetic number, because the mean of its divisors is an integer number (45494757).

Almost surely, 2^90989513 is an apocalyptic number.

It is an amenable number.

90989513 is a deficient number, since it is larger than the sum of its proper divisors (1).

90989513 is an equidigital number, since it uses as much as digits as its factorization.

90989513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 90989513 is about 9538.8423301782. The cubic root of 90989513 is about 449.7768655077.

The spelling of 90989513 in words is "ninety million, nine hundred eighty-nine thousand, five hundred thirteen".