139751391817 has 2 divisors, whose sum is σ = 139751391818. Its totient is φ = 139751391816.

The previous prime is 139751391811. The next prime is 139751391851. The reversal of 139751391817 is 718193157931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134465956416 + 5285435401 = 366696^2 + 72701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139751391817 is a prime.

It is a super-2 number, since 2×139751391817² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139751391811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69875695908 + 69875695909.

It is an arithmetic number, because the mean of its divisors is an integer number (69875695909).

Almost surely, 2^139751391817 is an apocalyptic number.

It is an amenable number.

139751391817 is a deficient number, since it is larger than the sum of its proper divisors (1).

139751391817 is an equidigital number, since it uses as much as digits as its factorization.

139751391817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 55.

The spelling of 139751391817 in words is "one hundred thirty-nine billion, seven hundred fifty-one million, three hundred ninety-one thousand, eight hundred seventeen".