137521242 has 12 divisors (see below), whose sum is σ = 297962730. Its totient is φ = 45840408.

The previous prime is 137521231. The next prime is 137521243. The reversal of 137521242 is 242125731.

137521242 is a `hidden beast` number, since 137 + 521 + 2 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 131125401 + 6395841 = 11451^2 + 2529^2 .

It is not an unprimeable number, because it can be changed into a prime (137521243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3820017 + ... + 3820052.

Almost surely, 2^137521242 is an apocalyptic number.

137521242 is an abundant number, since it is smaller than the sum of its proper divisors (160441488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

137521242 is a wasteful number, since it uses less digits than its factorization.

137521242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640077 (or 7640074 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 137521242 is about 11726.9451265025. The cubic root of 137521242 is about 516.1666353829.

Adding to 137521242 its reverse (242125731), we get a palindrome (379646973).

The spelling of 137521242 in words is "one hundred thirty-seven million, five hundred twenty-one thousand, two hundred forty-two".