137431717 has 4 divisors (see below), whose sum is σ = 137455360. Its totient is φ = 137408076.

The previous prime is 137431699. The next prime is 137431729. The reversal of 137431717 is 717134731.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 717134731 = 41 ⋅17491091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137431717 is a prime.

It is a super-4 number, since 4×137431717⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137431747) 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, 3634 + ... + 16972.

It is an arithmetic number, because the mean of its divisors is an integer number (34363840).

Almost surely, 2^137431717 is an apocalyptic number.

It is an amenable number.

137431717 is a deficient number, since it is larger than the sum of its proper divisors (23643).

137431717 is a wasteful number, since it uses less digits than its factorization.

137431717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23642.

The product of its digits is 12348, while the sum is 34.

The square root of 137431717 is about 11723.1274410884. The cubic root of 137431717 is about 516.0546045713.

The spelling of 137431717 in words is "one hundred thirty-seven million, four hundred thirty-one thousand, seven hundred seventeen".