51255313 has 4 divisors (see below), whose sum is σ = 51269668. Its totient is φ = 51240960.

The previous prime is 51255301. The next prime is 51255359. The reversal of 51255313 is 31355215.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31355215 = 5 ⋅6271043.

It can be written as a sum of positive squares in 2 ways, for example, as 15936064 + 35319249 = 3992^2 + 5943^2 .

It is a cyclic number.

It is not a de Polignac number, because 51255313 - 2¹³ = 51247121 is a prime.

It is a super-2 number, since 2×51255313² = 5254214221455938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51255913) 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, 2833 + ... + 10513.

It is an arithmetic number, because the mean of its divisors is an integer number (12817417).

Almost surely, 2^51255313 is an apocalyptic number.

It is an amenable number.

51255313 is a deficient number, since it is larger than the sum of its proper divisors (14355).

51255313 is an equidigital number, since it uses as much as digits as its factorization.

51255313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14354.

The product of its digits is 2250, while the sum is 25.

The square root of 51255313 is about 7159.2815980376. The cubic root of 51255313 is about 371.4607774201.

The spelling of 51255313 in words is "fifty-one million, two hundred fifty-five thousand, three hundred thirteen".