640595233 has 2 divisors, whose sum is σ = 640595234. Its totient is φ = 640595232.

The previous prime is 640595183. The next prime is 640595237. The reversal of 640595233 is 332595046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541632529 + 98962704 = 23273^2 + 9948^2 .

It is a cyclic number.

It is not a de Polignac number, because 640595233 - 2¹³ = 640587041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640595192 and 640595201.

It is not a weakly prime, because it can be changed into another prime (640595237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320297616 + 320297617.

It is an arithmetic number, because the mean of its divisors is an integer number (320297617).

Almost surely, 2^640595233 is an apocalyptic number.

It is an amenable number.

640595233 is a deficient number, since it is larger than the sum of its proper divisors (1).

640595233 is an equidigital number, since it uses as much as digits as its factorization.

640595233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 640595233 is about 25309.9828723767. The cubic root of 640595233 is about 862.0409579432.

The spelling of 640595233 in words is "six hundred forty million, five hundred ninety-five thousand, two hundred thirty-three".