51145004321 has 2 divisors, whose sum is σ = 51145004322. Its totient is φ = 51145004320.

The previous prime is 51145004279. The next prime is 51145004357. The reversal of 51145004321 is 12340054115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37611172096 + 13533832225 = 193936^2 + 116335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51145004321 is a prime.

It is a super-2 number, since 2×51145004321² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51145004921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25572502160 + 25572502161.

It is an arithmetic number, because the mean of its divisors is an integer number (25572502161).

Almost surely, 2^51145004321 is an apocalyptic number.

It is an amenable number.

51145004321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51145004321 is an equidigital number, since it uses as much as digits as its factorization.

51145004321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 51145004321 its reverse (12340054115), we get a palindrome (63485058436).

The spelling of 51145004321 in words is "fifty-one billion, one hundred forty-five million, four thousand, three hundred twenty-one".