255406719 has 4 divisors (see below), whose sum is σ = 340542296. Its totient is φ = 170271144.

The previous prime is 255406717. The next prime is 255406727. The reversal of 255406719 is 917604552.

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

It is not a de Polignac number, because 255406719 - 2¹ = 255406717 is a prime.

It is a super-2 number, since 2×255406719² = 130465184220689922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255406717) 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, 42567784 + ... + 42567789.

It is an arithmetic number, because the mean of its divisors is an integer number (85135574).

Almost surely, 2^255406719 is an apocalyptic number.

255406719 is a deficient number, since it is larger than the sum of its proper divisors (85135577).

255406719 is an equidigital number, since it uses as much as digits as its factorization.

255406719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85135576.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 255406719 is about 15981.4492146363. The cubic root of 255406719 is about 634.4695336290.

The spelling of 255406719 in words is "two hundred fifty-five million, four hundred six thousand, seven hundred nineteen".