137687381 has 8 divisors (see below), whose sum is σ = 148833720. Its totient is φ = 126620352.

The previous prime is 137687377. The next prime is 137687411. The reversal of 137687381 is 183786731.

It can be written as a sum of positive squares in 4 ways, for example, as 9205156 + 128482225 = 3034^2 + 11335^2 .

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 137687381 - 2² = 137687377 is a prime.

It is a super-2 number, since 2×137687381² = 37915629773278322, which 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 (137687311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16190 + ... + 23183.

It is an arithmetic number, because the mean of its divisors is an integer number (18604215).

Almost surely, 2^137687381 is an apocalyptic number.

It is an amenable number.

137687381 is a deficient number, since it is larger than the sum of its proper divisors (11146339).

137687381 is a wasteful number, since it uses less digits than its factorization.

137687381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39655.

The product of its digits is 169344, while the sum is 44.

The square root of 137687381 is about 11734.0266319793. The cubic root of 137687381 is about 516.3744115221.

The spelling of 137687381 in words is "one hundred thirty-seven million, six hundred eighty-seven thousand, three hundred eighty-one".