646115089 has 2 divisors, whose sum is σ = 646115090. Its totient is φ = 646115088.

The previous prime is 646115047. The next prime is 646115101. The reversal of 646115089 is 980511646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349690000 + 296425089 = 18700^2 + 17217^2 .

It is a cyclic number.

It is not a de Polignac number, because 646115089 - 2⁷ = 646114961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646115989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323057544 + 323057545.

It is an arithmetic number, because the mean of its divisors is an integer number (323057545).

Almost surely, 2^646115089 is an apocalyptic number.

It is an amenable number.

646115089 is a deficient number, since it is larger than the sum of its proper divisors (1).

646115089 is an equidigital number, since it uses as much as digits as its factorization.

646115089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 646115089 is about 25418.7940115183. The cubic root of 646115089 is about 864.5098803854.

The spelling of 646115089 in words is "six hundred forty-six million, one hundred fifteen thousand, eighty-nine".