137439477781 has 2 divisors, whose sum is σ = 137439477782. Its totient is φ = 137439477780.

The previous prime is 137439477751. The next prime is 137439477811. The reversal of 137439477781 is 187774934731.

It is a balanced prime because it is at equal distance from previous prime (137439477751) and next prime (137439477811).

It can be written as a sum of positive squares in only one way, i.e., 136777187556 + 662290225 = 369834^2 + 25735^2 .

It is a cyclic number.

It is not a de Polignac number, because 137439477781 - 2⁹ = 137439477269 is a prime.

It is a super-2 number, since 2×137439477781² (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 (137439477751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68719738890 + 68719738891.

It is an arithmetic number, because the mean of its divisors is an integer number (68719738891).

Almost surely, 2^137439477781 is an apocalyptic number.

It is an amenable number.

137439477781 is a deficient number, since it is larger than the sum of its proper divisors (1).

137439477781 is an equidigital number, since it uses as much as digits as its factorization.

137439477781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24893568, while the sum is 61.

The spelling of 137439477781 in words is "one hundred thirty-seven billion, four hundred thirty-nine million, four hundred seventy-seven thousand, seven hundred eighty-one".