90749717 has 2 divisors, whose sum is σ = 90749718. Its totient is φ = 90749716.

The previous prime is 90749699. The next prime is 90749753. The reversal of 90749717 is 71794709.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90744676 + 5041 = 9526^2 + 71^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90749717 is a prime.

It is a super-2 number, since 2×90749717² = 16471022271160178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90749767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45374858 + 45374859.

It is an arithmetic number, because the mean of its divisors is an integer number (45374859).

Almost surely, 2^90749717 is an apocalyptic number.

It is an amenable number.

90749717 is a deficient number, since it is larger than the sum of its proper divisors (1).

90749717 is an equidigital number, since it uses as much as digits as its factorization.

90749717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 90749717 is about 9526.2645879694. The cubic root of 90749717 is about 449.3814002272.

The spelling of 90749717 in words is "ninety million, seven hundred forty-nine thousand, seven hundred seventeen".