39129556481 has 2 divisors, whose sum is σ = 39129556482. Its totient is φ = 39129556480.

The previous prime is 39129556471. The next prime is 39129556511. The reversal of 39129556481 is 18465592193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39099130225 + 30426256 = 197735^2 + 5516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39129556481 is a prime.

It is a super-2 number, since 2×39129556481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39129556471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19564778240 + 19564778241.

It is an arithmetic number, because the mean of its divisors is an integer number (19564778241).

Almost surely, 2^39129556481 is an apocalyptic number.

It is an amenable number.

39129556481 is a deficient number, since it is larger than the sum of its proper divisors (1).

39129556481 is an equidigital number, since it uses as much as digits as its factorization.

39129556481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 53.

The spelling of 39129556481 in words is "thirty-nine billion, one hundred twenty-nine million, five hundred fifty-six thousand, four hundred eighty-one".