1255210513 has 4 divisors (see below), whose sum is σ = 1255417380. Its totient is φ = 1255003648.

The previous prime is 1255210507. The next prime is 1255210543. The reversal of 1255210513 is 3150125521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 609694864 + 645515649 = 24692^2 + 25407^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255210513 - 2²⁵ = 1221656081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255210543) 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, 94048 + ... + 106561.

It is an arithmetic number, because the mean of its divisors is an integer number (313854345).

Almost surely, 2^1255210513 is an apocalyptic number.

It is an amenable number.

1255210513 is a deficient number, since it is larger than the sum of its proper divisors (206867).

1255210513 is an equidigital number, since it uses as much as digits as its factorization.

1255210513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206866.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1255210513 is about 35428.9502102447. The cubic root of 1255210513 is about 1078.7120314416.

The spelling of 1255210513 in words is "one billion, two hundred fifty-five million, two hundred ten thousand, five hundred thirteen".