51530533469 has 2 divisors, whose sum is σ = 51530533470. Its totient is φ = 51530533468.

The previous prime is 51530533459. The next prime is 51530533511. The reversal of 51530533469 is 96433503515.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42201484900 + 9329048569 = 205430^2 + 96587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51530533469 is a prime.

It is a super-2 number, since 2×51530533469² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51530533429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765266734 + 25765266735.

It is an arithmetic number, because the mean of its divisors is an integer number (25765266735).

Almost surely, 2^51530533469 is an apocalyptic number.

It is an amenable number.

51530533469 is a deficient number, since it is larger than the sum of its proper divisors (1).

51530533469 is an equidigital number, since it uses as much as digits as its factorization.

51530533469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729000, while the sum is 44.

The spelling of 51530533469 in words is "fifty-one billion, five hundred thirty million, five hundred thirty-three thousand, four hundred sixty-nine".