640183189 has 2 divisors, whose sum is σ = 640183190. Its totient is φ = 640183188.

The previous prime is 640183157. The next prime is 640183211. The reversal of 640183189 is 981381046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490976964 + 149206225 = 22158^2 + 12215^2 .

It is a cyclic number.

It is not a de Polignac number, because 640183189 - 2⁵ = 640183157 is a prime.

It is a super-3 number, since 3×640183189³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640183289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320091594 + 320091595.

It is an arithmetic number, because the mean of its divisors is an integer number (320091595).

Almost surely, 2^640183189 is an apocalyptic number.

It is an amenable number.

640183189 is a deficient number, since it is larger than the sum of its proper divisors (1).

640183189 is an equidigital number, since it uses as much as digits as its factorization.

640183189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 640183189 is about 25301.8416128155. The cubic root of 640183189 is about 861.8560908225.

The spelling of 640183189 in words is "six hundred forty million, one hundred eighty-three thousand, one hundred eighty-nine".