51538528469 has 2 divisors, whose sum is σ = 51538528470. Its totient is φ = 51538528468.

The previous prime is 51538528403. The next prime is 51538528477. The reversal of 51538528469 is 96482583515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44399968369 + 7138560100 = 210713^2 + 84490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51538528469 is a prime.

It is a super-2 number, since 2×51538528469² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51538528169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25769264234 + 25769264235.

It is an arithmetic number, because the mean of its divisors is an integer number (25769264235).

Almost surely, 2^51538528469 is an apocalyptic number.

It is an amenable number.

51538528469 is a deficient number, since it is larger than the sum of its proper divisors (1).

51538528469 is an equidigital number, since it uses as much as digits as its factorization.

51538528469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368000, while the sum is 56.

The spelling of 51538528469 in words is "fifty-one billion, five hundred thirty-eight million, five hundred twenty-eight thousand, four hundred sixty-nine".