137531065781 has 8 divisors (see below), whose sum is σ = 145945459800. Its totient is φ = 129152708608.

The previous prime is 137531065769. The next prime is 137531065823. The reversal of 137531065781 is 187560135731.

It can be written as a sum of positive squares in 4 ways, for example, as 21914065156 + 115617000625 = 148034^2 + 340025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 137531065781 - 2¹⁸ = 137530803637 is a prime.

It is a super-2 number, since 2×137531065781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137531065751) 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 in 7 ways as a sum of consecutive naturals, for example, 9001346 + ... + 9016611.

It is an arithmetic number, because the mean of its divisors is an integer number (18243182475).

Almost surely, 2^137531065781 is an apocalyptic number.

It is an amenable number.

137531065781 is a deficient number, since it is larger than the sum of its proper divisors (8414394019).

137531065781 is a wasteful number, since it uses less digits than its factorization.

137531065781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18018423.

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 137531065781 in words is "one hundred thirty-seven billion, five hundred thirty-one million, sixty-five thousand, seven hundred eighty-one".