139477735181 has 2 divisors, whose sum is σ = 139477735182. Its totient is φ = 139477735180.

The previous prime is 139477735171. The next prime is 139477735183. The reversal of 139477735181 is 181537774931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135104029225 + 4373705956 = 367565^2 + 66134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139477735181 is a prime.

It is a super-2 number, since 2×139477735181² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 139477735183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139477735183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69738867590 + 69738867591.

It is an arithmetic number, because the mean of its divisors is an integer number (69738867591).

Almost surely, 2^139477735181 is an apocalyptic number.

It is an amenable number.

139477735181 is a deficient number, since it is larger than the sum of its proper divisors (1).

139477735181 is an equidigital number, since it uses as much as digits as its factorization.

139477735181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 56.

The spelling of 139477735181 in words is "one hundred thirty-nine billion, four hundred seventy-seven million, seven hundred thirty-five thousand, one hundred eighty-one".