139249057781 has 2 divisors, whose sum is σ = 139249057782. Its totient is φ = 139249057780.

The previous prime is 139249057733. The next prime is 139249057793. The reversal of 139249057781 is 187750942931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109075630756 + 30173427025 = 330266^2 + 173705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139249057781 is a prime.

It is a super-2 number, since 2×139249057781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139249057081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69624528890 + 69624528891.

It is an arithmetic number, because the mean of its divisors is an integer number (69624528891).

Almost surely, 2^139249057781 is an apocalyptic number.

It is an amenable number.

139249057781 is a deficient number, since it is larger than the sum of its proper divisors (1).

139249057781 is an equidigital number, since it uses as much as digits as its factorization.

139249057781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The spelling of 139249057781 in words is "one hundred thirty-nine billion, two hundred forty-nine million, fifty-seven thousand, seven hundred eighty-one".