137281217 has 4 divisors (see below), whose sum is σ = 137321940. Its totient is φ = 137240496.

The previous prime is 137281169. The next prime is 137281229. The reversal of 137281217 is 712182731.

137281217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 52475536 + 84805681 = 7244^2 + 9209^2 .

It is a cyclic number.

It is not a de Polignac number, because 137281217 - 2⁶ = 137281153 is a prime.

It is a super-2 number, since 2×137281217² = 37692265082002178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137281247) 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, 14798 + ... + 22215.

It is an arithmetic number, because the mean of its divisors is an integer number (34330485).

Almost surely, 2^137281217 is an apocalyptic number.

It is an amenable number.

137281217 is a deficient number, since it is larger than the sum of its proper divisors (40723).

137281217 is an equidigital number, since it uses as much as digits as its factorization.

137281217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40722.

The product of its digits is 4704, while the sum is 32.

The square root of 137281217 is about 11716.7067472050. The cubic root of 137281217 is about 515.8661604784.

The spelling of 137281217 in words is "one hundred thirty-seven million, two hundred eighty-one thousand, two hundred seventeen".