51312782613 has 8 divisors (see below), whose sum is σ = 70776252000. Its totient is φ = 33028917488.

The previous prime is 51312782579. The next prime is 51312782617. The reversal of 51312782613 is 31628721315.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51312782613 - 2²⁹ = 50775911701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312782617) 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, 294900963 + ... + 294901136.

It is an arithmetic number, because the mean of its divisors is an integer number (8847031500).

Almost surely, 2^51312782613 is an apocalyptic number.

It is an amenable number.

51312782613 is a deficient number, since it is larger than the sum of its proper divisors (19463469387).

51312782613 is a wasteful number, since it uses less digits than its factorization.

51312782613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589802131.

The product of its digits is 60480, while the sum is 39.

The spelling of 51312782613 in words is "fifty-one billion, three hundred twelve million, seven hundred eighty-two thousand, six hundred thirteen".