1255519999 has 8 divisors (see below), whose sum is σ = 1286612208. Its totient is φ = 1224450240.

The previous prime is 1255519987. The next prime is 1255520003. The reversal of 1255519999 is 9999155521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1255519999 - 2²⁵ = 1221965567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255519949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193069 + ... + 199465.

It is an arithmetic number, because the mean of its divisors is an integer number (160826526).

Almost surely, 2^1255519999 is an apocalyptic number.

1255519999 is a deficient number, since it is larger than the sum of its proper divisors (31092209).

1255519999 is an equidigital number, since it uses as much as digits as its factorization.

1255519999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11225.

The product of its digits is 1640250, while the sum is 55.

The square root of 1255519999 is about 35433.3176403226. The cubic root of 1255519999 is about 1078.8006802736.

The spelling of 1255519999 in words is "one billion, two hundred fifty-five million, five hundred nineteen thousand, nine hundred ninety-nine".