51515132369 has 2 divisors, whose sum is σ = 51515132370. Its totient is φ = 51515132368.

The previous prime is 51515132311. The next prime is 51515132407. The reversal of 51515132369 is 96323151515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34479661969 + 17035470400 = 185687^2 + 130520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51515132369 is a prime.

It is a super-2 number, since 2×51515132369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51515132069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757566184 + 25757566185.

It is an arithmetic number, because the mean of its divisors is an integer number (25757566185).

Almost surely, 2^51515132369 is an apocalyptic number.

It is an amenable number.

51515132369 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515132369 is an equidigital number, since it uses as much as digits as its factorization.

51515132369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 41.

The spelling of 51515132369 in words is "fifty-one billion, five hundred fifteen million, one hundred thirty-two thousand, three hundred sixty-nine".