6494559421 has 24 divisors (see below), whose sum is σ = 7905596760. Its totient is φ = 5314038912.

The previous prime is 6494559413. The next prime is 6494559457. The reversal of 6494559421 is 1249554946.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3038765625 + 3455793796 = 55125^2 + 58786^2 .

It is not a de Polignac number, because 6494559421 - 2³ = 6494559413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6494553421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62295 + ... + 129883.

It is an arithmetic number, because the mean of its divisors is an integer number (329399865).

Almost surely, 2^6494559421 is an apocalyptic number.

It is an amenable number.

6494559421 is a deficient number, since it is larger than the sum of its proper divisors (1411037339).

6494559421 is a wasteful number, since it uses less digits than its factorization.

6494559421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67693 (or 67686 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 49.

The square root of 6494559421 is about 80588.8293810004. The cubic root of 6494559421 is about 1865.7347401985.

The spelling of 6494559421 in words is "six billion, four hundred ninety-four million, five hundred fifty-nine thousand, four hundred twenty-one".