51513055723531 has 4 divisors (see below), whose sum is σ = 54543235471992. Its totient is φ = 48482875975072.

The previous prime is 51513055723517. The next prime is 51513055723573. The reversal of 51513055723531 is 13532755031515.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51513055723531 - 2⁵ = 51513055723499 is a prime.

It is a super-2 number, since 2×51513055723531² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51513055723501) 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, 1515089874205 + ... + 1515089874238.

It is an arithmetic number, because the mean of its divisors is an integer number (13635808867998).

Almost surely, 2^{51513055723531} is an apocalyptic number.

51513055723531 is a deficient number, since it is larger than the sum of its proper divisors (3030179748461).

51513055723531 is a wasteful number, since it uses less digits than its factorization.

51513055723531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030179748460.

The product of its (nonzero) digits is 1181250, while the sum is 46.

The spelling of 51513055723531 in words is "fifty-one trillion, five hundred thirteen billion, fifty-five million, seven hundred twenty-three thousand, five hundred thirty-one".