137445381 has 12 divisors (see below), whose sum is σ = 199425408. Its totient is φ = 91218024.

The previous prime is 137445379. The next prime is 137445389. The reversal of 137445381 is 183544731.

It is a happy number.

137445381 is a `hidden beast` number, since 137 + 445 + 3 + 81 = 666.

It is not a de Polignac number, because 137445381 - 2¹ = 137445379 is a prime.

It is a super-2 number, since 2×137445381² = 37782465516470322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137445389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32235 + ... + 36248.

It is an arithmetic number, because the mean of its divisors is an integer number (16618784).

Almost surely, 2^137445381 is an apocalyptic number.

It is an amenable number.

137445381 is a deficient number, since it is larger than the sum of its proper divisors (61980027).

137445381 is a wasteful number, since it uses less digits than its factorization.

137445381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68712 (or 68709 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 137445381 is about 11723.7102062444. The cubic root of 137445381 is about 516.0717067284.

The spelling of 137445381 in words is "one hundred thirty-seven million, four hundred forty-five thousand, three hundred eighty-one".