7903105981 has 4 divisors (see below), whose sum is σ = 7905651100. Its totient is φ = 7900560864.

The previous prime is 7903105957. The next prime is 7903106023. The reversal of 7903105981 is 1895013097.

7903105981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 1798184025 + 6104921956 = 42405^2 + 78134^2 .

It is a cyclic number.

It is not a de Polignac number, because 7903105981 - 2⁷ = 7903105853 is a prime.

It is a super-2 number, since 2×7903105981² (a number of 21 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 (7903105901) 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, 1267896 + ... + 1274113.

It is an arithmetic number, because the mean of its divisors is an integer number (1976412775).

Almost surely, 2^7903105981 is an apocalyptic number.

It is an amenable number.

7903105981 is a deficient number, since it is larger than the sum of its proper divisors (2545119).

7903105981 is a wasteful number, since it uses less digits than its factorization.

7903105981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545118.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 7903105981 is about 88899.4149643292. The cubic root of 7903105981 is about 1991.8926784926.

The spelling of 7903105981 in words is "seven billion, nine hundred three million, one hundred five thousand, nine hundred eighty-one".