3118135721 has 8 divisors (see below), whose sum is σ = 3138700224. Its totient is φ = 3097589040.

The previous prime is 3118135717. The next prime is 3118135723. The reversal of 3118135721 is 1275318113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3118135721 - 2² = 3118135717 is a prime.

It is a super-3 number, since 3×3118135721³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3118135723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703091 + ... + 707511.

It is an arithmetic number, because the mean of its divisors is an integer number (392337528).

Almost surely, 2^3118135721 is an apocalyptic number.

It is an amenable number.

3118135721 is a deficient number, since it is larger than the sum of its proper divisors (20564503).

3118135721 is a wasteful number, since it uses less digits than its factorization.

3118135721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8911.

The product of its digits is 5040, while the sum is 32.

The square root of 3118135721 is about 55840.2697074432. The cubic root of 3118135721 is about 1460.9376164399.

The spelling of 3118135721 in words is "three billion, one hundred eighteen million, one hundred thirty-five thousand, seven hundred twenty-one".