137721717 has 12 divisors (see below), whose sum is σ = 227350240. Its totient is φ = 78698088.

The previous prime is 137721707. The next prime is 137721739. The reversal of 137721717 is 717127731.

It is not a de Polignac number, because 137721717 - 2²⁴ = 120944501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137721707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1092967 + ... + 1093092.

Almost surely, 2^137721717 is an apocalyptic number.

It is an amenable number.

137721717 is a deficient number, since it is larger than the sum of its proper divisors (89628523).

137721717 is a wasteful number, since it uses less digits than its factorization.

137721717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186072 (or 2186069 counting only the distinct ones).

The product of its digits is 14406, while the sum is 36.

The square root of 137721717 is about 11735.4896361422. The cubic root of 137721717 is about 516.4173318392.

The spelling of 137721717 in words is "one hundred thirty-seven million, seven hundred twenty-one thousand, seven hundred seventeen".