3121735681 has 8 divisors (see below), whose sum is σ = 3224918528. Its totient is φ = 3018708000.

The previous prime is 3121735649. The next prime is 3121735691. The reversal of 3121735681 is 1865371213.

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 3121735681 - 2⁵ = 3121735649 is a prime.

It is a super-2 number, since 2×3121735681² = 19490467324057067522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121735681.

It is not an unprimeable number, because it can be changed into a prime (3121735601) 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, 2836 + ... + 79066.

It is an arithmetic number, because the mean of its divisors is an integer number (403114816).

Almost surely, 2^3121735681 is an apocalyptic number.

3121735681 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3121735681 is a deficient number, since it is larger than the sum of its proper divisors (103182847).

3121735681 is a wasteful number, since it uses less digits than its factorization.

3121735681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77583.

The product of its digits is 30240, while the sum is 37.

The square root of 3121735681 is about 55872.4948521184. The cubic root of 3121735681 is about 1461.4996289957.

The spelling of 3121735681 in words is "three billion, one hundred twenty-one million, seven hundred thirty-five thousand, six hundred eighty-one".