1255800813 has 8 divisors (see below), whose sum is σ = 1683756000. Its totient is φ = 832523088.

The previous prime is 1255800797. The next prime is 1255800817. The reversal of 1255800813 is 3180085521.

It is a happy number.

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

It is not a de Polignac number, because 1255800813 - 2⁴ = 1255800797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255800817) 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, 1168738 + ... + 1169811.

It is an arithmetic number, because the mean of its divisors is an integer number (210469500).

Almost surely, 2^1255800813 is an apocalyptic number.

It is an amenable number.

1255800813 is a deficient number, since it is larger than the sum of its proper divisors (427955187).

1255800813 is a wasteful number, since it uses less digits than its factorization.

1255800813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338731.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 1255800813 is about 35437.2799887350. The cubic root of 1255800813 is about 1078.8811037241.

The spelling of 1255800813 in words is "one billion, two hundred fifty-five million, eight hundred thousand, eight hundred thirteen".