90875717 has 2 divisors, whose sum is σ = 90875718. Its totient is φ = 90875716.

The previous prime is 90875713. The next prime is 90875723. The reversal of 90875717 is 71757809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74114881 + 16760836 = 8609^2 + 4094^2 .

It is an emirp because it is prime and its reverse (71757809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90875717 - 2² = 90875713 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90875713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45437858 + 45437859.

It is an arithmetic number, because the mean of its divisors is an integer number (45437859).

Almost surely, 2^90875717 is an apocalyptic number.

It is an amenable number.

90875717 is a deficient number, since it is larger than the sum of its proper divisors (1).

90875717 is an equidigital number, since it uses as much as digits as its factorization.

90875717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123480, while the sum is 44.

The square root of 90875717 is about 9532.8755892438. The cubic root of 90875717 is about 449.5892828637.

The spelling of 90875717 in words is "ninety million, eight hundred seventy-five thousand, seven hundred seventeen".