90788513 has 2 divisors, whose sum is σ = 90788514. Its totient is φ = 90788512.

The previous prime is 90788419. The next prime is 90788519. The reversal of 90788513 is 31588709.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82591744 + 8196769 = 9088^2 + 2863^2 .

It is an emirp because it is prime and its reverse (31588709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90788513 - 2¹⁸ = 90526369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90788519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45394256 + 45394257.

It is an arithmetic number, because the mean of its divisors is an integer number (45394257).

Almost surely, 2^90788513 is an apocalyptic number.

It is an amenable number.

90788513 is a deficient number, since it is larger than the sum of its proper divisors (1).

90788513 is an equidigital number, since it uses as much as digits as its factorization.

90788513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 90788513 is about 9528.3006354754. The cubic root of 90788513 is about 449.4454287721.

The spelling of 90788513 in words is "ninety million, seven hundred eighty-eight thousand, five hundred thirteen".