90690617 has 2 divisors, whose sum is σ = 90690618. Its totient is φ = 90690616.

The previous prime is 90690583. The next prime is 90690623. The reversal of 90690617 is 71609609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82828201 + 7862416 = 9101^2 + 2804^2 .

It is a cyclic number.

It is not a de Polignac number, because 90690617 - 2²⁰ = 89642041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90620617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45345308 + 45345309.

It is an arithmetic number, because the mean of its divisors is an integer number (45345309).

Almost surely, 2^90690617 is an apocalyptic number.

It is an amenable number.

90690617 is a deficient number, since it is larger than the sum of its proper divisors (1).

90690617 is an equidigital number, since it uses as much as digits as its factorization.

90690617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 90690617 is about 9523.1621324012. The cubic root of 90690617 is about 449.2838270739.

The spelling of 90690617 in words is "ninety million, six hundred ninety thousand, six hundred seventeen".