51253213513 has 4 divisors (see below), whose sum is σ = 51255675028. Its totient is φ = 51250752000.

The previous prime is 51253213489. The next prime is 51253213553. The reversal of 51253213513 is 31531235215.

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 6201877504 + 45051336009 = 78752^2 + 212253^2 .

It is a cyclic number.

It is not a de Polignac number, because 51253213513 - 2¹³ = 51253205321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51253213553) 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, 1199256 + ... + 1241257.

It is an arithmetic number, because the mean of its divisors is an integer number (12813918757).

Almost surely, 2^51253213513 is an apocalyptic number.

It is an amenable number.

51253213513 is a deficient number, since it is larger than the sum of its proper divisors (2461515).

51253213513 is a wasteful number, since it uses less digits than its factorization.

51253213513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461514.

The product of its digits is 13500, while the sum is 31.

Adding to 51253213513 its reverse (31531235215), we get a palindrome (82784448728).

The spelling of 51253213513 in words is "fifty-one billion, two hundred fifty-three million, two hundred thirteen thousand, five hundred thirteen".