90776513 has 2 divisors, whose sum is σ = 90776514. Its totient is φ = 90776512.

The previous prime is 90776507. The next prime is 90776531. The reversal of 90776513 is 31567709.

Together with next prime (90776531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74511424 + 16265089 = 8632^2 + 4033^2 .

It is an emirp because it is prime and its reverse (31567709) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90776513 is a prime.

It is not a weakly prime, because it can be changed into another prime (90776533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45388256 + 45388257.

It is an arithmetic number, because the mean of its divisors is an integer number (45388257).

Almost surely, 2^90776513 is an apocalyptic number.

It is an amenable number.

90776513 is a deficient number, since it is larger than the sum of its proper divisors (1).

90776513 is an equidigital number, since it uses as much as digits as its factorization.

90776513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 38.

The square root of 90776513 is about 9527.6709116132. The cubic root of 90776513 is about 449.4256260364.

The spelling of 90776513 in words is "ninety million, seven hundred seventy-six thousand, five hundred thirteen".