137717721 has 12 divisors (see below), whose sum is σ = 207574848. Its totient is φ = 87819864.

The previous prime is 137717711. The next prime is 137717761. The reversal of 137717721 is 127717731.

It is not a de Polignac number, because 137717721 - 2⁵ = 137717689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137717711) 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, 332445 + ... + 332858.

It is an arithmetic number, because the mean of its divisors is an integer number (17297904).

Almost surely, 2^137717721 is an apocalyptic number.

It is an amenable number.

137717721 is a deficient number, since it is larger than the sum of its proper divisors (69857127).

137717721 is a wasteful number, since it uses less digits than its factorization.

137717721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665332 (or 665329 counting only the distinct ones).

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

The square root of 137717721 is about 11735.3193821046. The cubic root of 137717721 is about 516.4123371692.

The spelling of 137717721 in words is "one hundred thirty-seven million, seven hundred seventeen thousand, seven hundred twenty-one".