1255205005 has 4 divisors (see below), whose sum is σ = 1506246012. Its totient is φ = 1004164000.

The previous prime is 1255204969. The next prime is 1255205011. The reversal of 1255205005 is 5005025521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5005025521 = 137 ⋅36533033.

It can be written as a sum of positive squares in 2 ways, for example, as 328733161 + 926471844 = 18131^2 + 30438^2 .

It is not a de Polignac number, because 1255205005 - 2⁹ = 1255204493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125520496 + ... + 125520505.

It is an arithmetic number, because the mean of its divisors is an integer number (376561503).

Almost surely, 2^1255205005 is an apocalyptic number.

It is an amenable number.

1255205005 is a deficient number, since it is larger than the sum of its proper divisors (251041007).

1255205005 is an equidigital number, since it uses as much as digits as its factorization.

1255205005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251041006.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 1255205005 is about 35428.8724771196. The cubic root of 1255205005 is about 1078.7104536041.

The spelling of 1255205005 in words is "one billion, two hundred fifty-five million, two hundred five thousand, five".