3178040443981 has 4 divisors (see below), whose sum is σ = 3422505093532. Its totient is φ = 2933575794432.

The previous prime is 3178040443973. The next prime is 3178040443999. The reversal of 3178040443981 is 1893440408713.

It is a happy number.

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 1628837035081 + 1549203408900 = 1276259^2 + 1244670^2 .

It is a cyclic number.

It is not a de Polignac number, because 3178040443981 - 2³ = 3178040443973 is a prime.

It is a super-2 number, since 2×3178040443981² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3178040443951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122232324756 + ... + 122232324781.

It is an arithmetic number, because the mean of its divisors is an integer number (855626273383).

Almost surely, 2^{3178040443981} is an apocalyptic number.

It is an amenable number.

3178040443981 is a deficient number, since it is larger than the sum of its proper divisors (244464649551).

3178040443981 is a wasteful number, since it uses less digits than its factorization.

3178040443981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244464649550.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 3178040443981 in words is "three trillion, one hundred seventy-eight billion, forty million, four hundred forty-three thousand, nine hundred eighty-one".