51135355231 has 4 divisors (see below), whose sum is σ = 51274688992. Its totient is φ = 50996021472.

The previous prime is 51135355169. The next prime is 51135355289. The reversal of 51135355231 is 13255353115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13255353115 = 5 ⋅2651070623.

It is a cyclic number.

It is not a de Polignac number, because 51135355231 - 2¹⁷ = 51135224159 is a prime.

It is a super-2 number, since 2×51135355231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51135355031) 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, 69666330 + ... + 69667063.

It is an arithmetic number, because the mean of its divisors is an integer number (12818672248).

Almost surely, 2^51135355231 is an apocalyptic number.

51135355231 is a deficient number, since it is larger than the sum of its proper divisors (139333761).

51135355231 is a wasteful number, since it uses less digits than its factorization.

51135355231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139333760.

The product of its digits is 33750, while the sum is 34.

The spelling of 51135355231 in words is "fifty-one billion, one hundred thirty-five million, three hundred fifty-five thousand, two hundred thirty-one".