255640219 has 4 divisors (see below), whose sum is σ = 257506344. Its totient is φ = 253774096.

The previous prime is 255640211. The next prime is 255640223. The reversal of 255640219 is 912046552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255640219 - 2³ = 255640211 is a prime.

It is a super-2 number, since 2×255640219² = 130703843140735922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255640211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932857 + ... + 933130.

It is an arithmetic number, because the mean of its divisors is an integer number (64376586).

Almost surely, 2^255640219 is an apocalyptic number.

255640219 is a deficient number, since it is larger than the sum of its proper divisors (1866125).

255640219 is a wasteful number, since it uses less digits than its factorization.

255640219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866124.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 255640219 is about 15988.7528907041. The cubic root of 255640219 is about 634.6628246961.

The spelling of 255640219 in words is "two hundred fifty-five million, six hundred forty thousand, two hundred nineteen".