139365617287121 has 2 divisors, whose sum is σ = 139365617287122. Its totient is φ = 139365617287120.

The previous prime is 139365617287097. The next prime is 139365617287123. The reversal of 139365617287121 is 121782716563931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138890467632400 + 475149654721 = 11785180^2 + 689311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139365617287121 is a prime.

Together with 139365617287123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139365617287123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69682808643560 + 69682808643561.

It is an arithmetic number, because the mean of its divisors is an integer number (69682808643561).

Almost surely, 2^{139365617287121} is an apocalyptic number.

It is an amenable number.

139365617287121 is a deficient number, since it is larger than the sum of its proper divisors (1).

139365617287121 is an equidigital number, since it uses as much as digits as its factorization.

139365617287121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 62.

The spelling of 139365617287121 in words is "one hundred thirty-nine trillion, three hundred sixty-five billion, six hundred seventeen million, two hundred eighty-seven thousand, one hundred twenty-one".