90749 has 2 divisors, whose sum is σ = 90750.
Its totient is φ = 90748.
The previous prime is 90731. The next prime is 90787. The reversal of 90749 is 94709.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 85849 + 4900 = 293^2 + 70^2
It is an emirp because it is prime and its reverse (94709) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-90749 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is an alternating number because its digits alternate between odd and even.
It is a Curzon number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (90709) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45374 + 45375.
It is an arithmetic number, because the mean of its divisors is an integer number (45375).
290749 is an apocalyptic number.
It is an amenable number.
90749 is a deficient number, since it is larger than the sum of its proper divisors (1).
90749 is an equidigital number, since it uses as much as digits as its factorization.
90749 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 2268, while the sum is 29.
The square root of 90749 is about 301.2457468579.
The cubic root of 90749 is about 44.9380216726.
The spelling of 90749 in words is "ninety thousand, seven hundred forty-nine".