137712217 has 4 divisors (see below), whose sum is σ = 137736100. Its totient is φ = 137688336.

The previous prime is 137712193. The next prime is 137712241. The reversal of 137712217 is 712217731.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (137712193) and next prime (137712241).

It can be written as a sum of positive squares in 2 ways, for example, as 124902976 + 12809241 = 11176^2 + 3579^2 .

It is a cyclic number.

It is not a de Polignac number, because 137712217 - 2²⁷ = 3494489 is a prime.

It is a super-2 number, since 2×137712217² = 37929309422110178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137712277) 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, 2659 + ... + 16807.

It is an arithmetic number, because the mean of its divisors is an integer number (34434025).

Almost surely, 2^137712217 is an apocalyptic number.

It is an amenable number.

137712217 is a deficient number, since it is larger than the sum of its proper divisors (23883).

137712217 is an equidigital number, since it uses as much as digits as its factorization.

137712217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23882.

The product of its digits is 4116, while the sum is 31.

The square root of 137712217 is about 11735.0848740007. The cubic root of 137712217 is about 516.4054574654.

Adding to 137712217 its reverse (712217731), we get a palindrome (849929948).

The spelling of 137712217 in words is "one hundred thirty-seven million, seven hundred twelve thousand, two hundred seventeen".