6481172861 has 2 divisors, whose sum is σ = 6481172862. Its totient is φ = 6481172860.

The previous prime is 6481172843. The next prime is 6481172899. The reversal of 6481172861 is 1682711846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5825505625 + 655667236 = 76325^2 + 25606^2 .

It is a cyclic number.

It is not a de Polignac number, because 6481172861 - 2¹⁴ = 6481156477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6481172261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3240586430 + 3240586431.

It is an arithmetic number, because the mean of its divisors is an integer number (3240586431).

Almost surely, 2^6481172861 is an apocalyptic number.

It is an amenable number.

6481172861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6481172861 is an equidigital number, since it uses as much as digits as its factorization.

6481172861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 44.

The square root of 6481172861 is about 80505.7318518377. The cubic root of 6481172861 is about 1864.4519767814.

The spelling of 6481172861 in words is "six billion, four hundred eighty-one million, one hundred seventy-two thousand, eight hundred sixty-one".