137507217 has 4 divisors (see below), whose sum is σ = 183342960. Its totient is φ = 91671476.

The previous prime is 137507189. The next prime is 137507219. The reversal of 137507217 is 712705731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712705731 = 3 ⋅237568577.

It is a cyclic number.

It is not a de Polignac number, because 137507217 - 2⁷ = 137507089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137507219) 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, 22917867 + ... + 22917872.

It is an arithmetic number, because the mean of its divisors is an integer number (45835740).

Almost surely, 2^137507217 is an apocalyptic number.

It is an amenable number.

137507217 is a deficient number, since it is larger than the sum of its proper divisors (45835743).

137507217 is an equidigital number, since it uses as much as digits as its factorization.

137507217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45835742.

The product of its (nonzero) digits is 10290, while the sum is 33.

The square root of 137507217 is about 11726.3471294346. The cubic root of 137507217 is about 516.1490878315.

The spelling of 137507217 in words is "one hundred thirty-seven million, five hundred seven thousand, two hundred seventeen".