51530543369 has 2 divisors, whose sum is σ = 51530543370. Its totient is φ = 51530543368.

The previous prime is 51530543303. The next prime is 51530543401. The reversal of 51530543369 is 96334503515.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33490830025 + 18039713344 = 183005^2 + 134312^2 .

It is a cyclic number.

It is not a de Polignac number, because 51530543369 - 2¹² = 51530539273 is a prime.

It is a super-2 number, since 2×51530543369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51530542369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765271684 + 25765271685.

It is an arithmetic number, because the mean of its divisors is an integer number (25765271685).

Almost surely, 2^51530543369 is an apocalyptic number.

It is an amenable number.

51530543369 is a deficient number, since it is larger than the sum of its proper divisors (1).

51530543369 is an equidigital number, since it uses as much as digits as its factorization.

51530543369 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 51530543369 in words is "fifty-one billion, five hundred thirty million, five hundred forty-three thousand, three hundred sixty-nine".