51239302321 has 9 divisors (see below), whose sum is σ = 52529037249. Its totient is φ = 49980508800.

The previous prime is 51239302313. The next prime is 51239302337. The reversal of 51239302321 is 12320393215.

The square root of 51239302321 is 226361.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 25869183921 + 25370118400 = 160839^2 + 159280^2 .

It is not a de Polignac number, because 51239302321 - 2³ = 51239302313 is a prime.

It is a super-2 number, since 2×51239302321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51239312321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9278041 + ... + 9283561.

Almost surely, 2^51239302321 is an apocalyptic number.

51239302321 is the 226361-st square number.

51239302321 is the 113181-st centered octagonal number.

It is an amenable number.

51239302321 is a deficient number, since it is larger than the sum of its proper divisors (1289734928).

51239302321 is an frugal number, since it uses more digits than its factorization.

51239302321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11124 (or 5562 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 31.

Adding to 51239302321 its reverse (12320393215), we get a palindrome (63559695536).

The spelling of 51239302321 in words is "fifty-one billion, two hundred thirty-nine million, three hundred two thousand, three hundred twenty-one".