639416233 has 2 divisors, whose sum is σ = 639416234. Its totient is φ = 639416232.

The previous prime is 639416209. The next prime is 639416243. The reversal of 639416233 is 332614936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625600144 + 13816089 = 25012^2 + 3717^2 .

It is a cyclic number.

It is not a de Polignac number, because 639416233 - 2¹³ = 639408041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 639416192 and 639416201.

It is not a weakly prime, because it can be changed into another prime (639416243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319708116 + 319708117.

It is an arithmetic number, because the mean of its divisors is an integer number (319708117).

Almost surely, 2^639416233 is an apocalyptic number.

It is an amenable number.

639416233 is a deficient number, since it is larger than the sum of its proper divisors (1).

639416233 is an equidigital number, since it uses as much as digits as its factorization.

639416233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 37.

The square root of 639416233 is about 25286.6809407641. The cubic root of 639416233 is about 861.5117779995.

The spelling of 639416233 in words is "six hundred thirty-nine million, four hundred sixteen thousand, two hundred thirty-three".