139507594781 has 2 divisors, whose sum is σ = 139507594782. Its totient is φ = 139507594780.

The previous prime is 139507594763. The next prime is 139507594799. The reversal of 139507594781 is 187495705931.

It is a balanced prime because it is at equal distance from previous prime (139507594763) and next prime (139507594799).

It can be written as a sum of positive squares in only one way, i.e., 107633205625 + 31874389156 = 328075^2 + 178534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139507594781 is a prime.

It is a super-2 number, since 2×139507594781² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139507594781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139507591781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69753797390 + 69753797391.

It is an arithmetic number, because the mean of its divisors is an integer number (69753797391).

Almost surely, 2^139507594781 is an apocalyptic number.

It is an amenable number.

139507594781 is a deficient number, since it is larger than the sum of its proper divisors (1).

139507594781 is an equidigital number, since it uses as much as digits as its factorization.

139507594781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9525600, while the sum is 59.

The spelling of 139507594781 in words is "one hundred thirty-nine billion, five hundred seven million, five hundred ninety-four thousand, seven hundred eighty-one".