1255220513 has 4 divisors (see below), whose sum is σ = 1255299888. Its totient is φ = 1255141140.

The previous prime is 1255220501. The next prime is 1255220539. The reversal of 1255220513 is 3150225521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1255220513 - 2²⁶ = 1188111649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255220563) 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, 6983 + ... + 50588.

It is an arithmetic number, because the mean of its divisors is an integer number (313824972).

Almost surely, 2^1255220513 is an apocalyptic number.

It is an amenable number.

1255220513 is a deficient number, since it is larger than the sum of its proper divisors (79375).

1255220513 is an equidigital number, since it uses as much as digits as its factorization.

1255220513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79374.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1255220513 is about 35429.0913374871. The cubic root of 1255220513 is about 1078.7148960585.

The spelling of 1255220513 in words is "one billion, two hundred fifty-five million, two hundred twenty thousand, five hundred thirteen".