137821241 has 4 divisors (see below), whose sum is σ = 139041012. Its totient is φ = 136601472.

The previous prime is 137821237. The next prime is 137821273. The reversal of 137821241 is 142128731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74459641 + 63361600 = 8629^2 + 7960^2 .

It is a cyclic number.

It is not a de Polignac number, because 137821241 - 2² = 137821237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137821291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609716 + ... + 609941.

It is an arithmetic number, because the mean of its divisors is an integer number (34760253).

Almost surely, 2^137821241 is an apocalyptic number.

It is an amenable number.

137821241 is a deficient number, since it is larger than the sum of its proper divisors (1219771).

137821241 is a wasteful number, since it uses less digits than its factorization.

137821241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219770.

The product of its digits is 2688, while the sum is 29.

The square root of 137821241 is about 11739.7291706410. The cubic root of 137821241 is about 516.5416974665.

Adding to 137821241 its reverse (142128731), we get a palindrome (279949972).

The spelling of 137821241 in words is "one hundred thirty-seven million, eight hundred twenty-one thousand, two hundred forty-one".