90709 has 2 divisors, whose sum is σ = 90710. Its totient is φ = 90708.

The previous prime is 90703. The next prime is 90731.

90709 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88209 + 2500 = 297^2 + 50^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 90709 - 2⁵ = 90677 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45354 + 45355.

It is an arithmetic number, because the mean of its divisors is an integer number (45355).

2⁹⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

90709 is a deficient number, since it is larger than the sum of its proper divisors (1).

90709 is an equidigital number, since it uses as much as digits as its factorization.

90709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 90709 is about 301.1793485616. The cubic root of 90709 is about 44.9314181653.

The spelling of 90709 in words is "ninety thousand, seven hundred nine".