4781147981 has 2 divisors, whose sum is σ = 4781147982. Its totient is φ = 4781147980.

The previous prime is 4781147957. The next prime is 4781147993. The reversal of 4781147981 is 1897411874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3298204900 + 1482943081 = 57430^2 + 38509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4781147981 is a prime.

It is a super-2 number, since 2×4781147981² = 45718752032440752722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4781147911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2390573990 + 2390573991.

It is an arithmetic number, because the mean of its divisors is an integer number (2390573991).

Almost surely, 2^4781147981 is an apocalyptic number.

It is an amenable number.

4781147981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4781147981 is an equidigital number, since it uses as much as digits as its factorization.

4781147981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 50.

The square root of 4781147981 is about 69145.8457248156. The cubic root of 4781147981 is about 1684.6540430373.

The spelling of 4781147981 in words is "four billion, seven hundred eighty-one million, one hundred forty-seven thousand, nine hundred eighty-one".