51504323413 has 4 divisors (see below), whose sum is σ = 51788877868. Its totient is φ = 51219768960.

The previous prime is 51504323401. The next prime is 51504323467. The reversal of 51504323413 is 31432340515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31432340515 = 5 ⋅6286468103.

It can be written as a sum of positive squares in 2 ways, for example, as 12334767844 + 39169555569 = 111062^2 + 197913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51504323413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51504323113) 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, 142276956 + ... + 142277317.

It is an arithmetic number, because the mean of its divisors is an integer number (12947219467).

Almost surely, 2^51504323413 is an apocalyptic number.

It is an amenable number.

51504323413 is a deficient number, since it is larger than the sum of its proper divisors (284554455).

51504323413 is a wasteful number, since it uses less digits than its factorization.

51504323413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284554454.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 51504323413 its reverse (31432340515), we get a palindrome (82936663928).

The spelling of 51504323413 in words is "fifty-one billion, five hundred four million, three hundred twenty-three thousand, four hundred thirteen".