3120231718081 has 4 divisors (see below), whose sum is σ = 3128252879700. Its totient is φ = 3112210556464.

The previous prime is 3120231718073. The next prime is 3120231718091. The reversal of 3120231718081 is 1808171320213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1172490489856 + 1947741228225 = 1082816^2 + 1395615^2 .

It is a cyclic number.

It is not a de Polignac number, because 3120231718081 - 2³ = 3120231718073 is a prime.

It is a super-2 number, since 2×3120231718081² (a number of 26 digits) 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 3120231718081.

It is not an unprimeable number, because it can be changed into a prime (3120231718091) 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, 4010580226 + ... + 4010581003.

It is an arithmetic number, because the mean of its divisors is an integer number (782063219925).

Almost surely, 2^{3120231718081} is an apocalyptic number.

It is an amenable number.

3120231718081 is a deficient number, since it is larger than the sum of its proper divisors (8021161619).

3120231718081 is an equidigital number, since it uses as much as digits as its factorization.

3120231718081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8021161618.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 3120231718081 in words is "three trillion, one hundred twenty billion, two hundred thirty-one million, seven hundred eighteen thousand, eighty-one".