137231217 has 6 divisors (see below), whose sum is σ = 198222882. Its totient is φ = 91487472.

The previous prime is 137231201. The next prime is 137231233. The reversal of 137231217 is 712132731.

It is an interprime number because it is at equal distance from previous prime (137231201) and next prime (137231233).

It can be written as a sum of positive squares in only one way, i.e., 101123136 + 36108081 = 10056^2 + 6009^2 .

It is not a de Polignac number, because 137231217 - 2⁴ = 137231201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137231267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7623948 + ... + 7623965.

It is an arithmetic number, because the mean of its divisors is an integer number (33037147).

Almost surely, 2^137231217 is an apocalyptic number.

It is an amenable number.

137231217 is a deficient number, since it is larger than the sum of its proper divisors (60991665).

137231217 is a wasteful number, since it uses less digits than its factorization.

137231217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15247919 (or 15247916 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 137231217 is about 11714.5728475263. The cubic root of 137231217 is about 515.8035239900.

Adding to 137231217 its reverse (712132731), we get a palindrome (849363948).

The spelling of 137231217 in words is "one hundred thirty-seven million, two hundred thirty-one thousand, two hundred seventeen".