6461719181 has 2 divisors, whose sum is σ = 6461719182. Its totient is φ = 6461719180.

The previous prime is 6461719171. The next prime is 6461719223. The reversal of 6461719181 is 1819171646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6394561156 + 67158025 = 79966^2 + 8195^2 .

It is a cyclic number.

It is not a de Polignac number, because 6461719181 - 2¹⁰ = 6461718157 is a prime.

It is a super-2 number, since 2×6461719181² = 83507629548206621522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6461719141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3230859590 + 3230859591.

It is an arithmetic number, because the mean of its divisors is an integer number (3230859591).

Almost surely, 2^6461719181 is an apocalyptic number.

It is an amenable number.

6461719181 is a deficient number, since it is larger than the sum of its proper divisors (1).

6461719181 is an equidigital number, since it uses as much as digits as its factorization.

6461719181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 6461719181 is about 80384.8193442020. The cubic root of 6461719181 is about 1862.5846808998.

The spelling of 6461719181 in words is "six billion, four hundred sixty-one million, seven hundred nineteen thousand, one hundred eighty-one".