6449881 has 2 divisors, whose sum is σ = 6449882. Its totient is φ = 6449880.

The previous prime is 6449837. The next prime is 6449887. The reversal of 6449881 is 1889446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5784025 + 665856 = 2405^2 + 816^2 .

It is a cyclic number.

It is not a de Polignac number, because 6449881 - 2⁷ = 6449753 is a prime.

It is a super-2 number, since 2×6449881² = 83201929828322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6449887) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224940 + 3224941.

It is an arithmetic number, because the mean of its divisors is an integer number (3224941).

Almost surely, 2^6449881 is an apocalyptic number.

It is an amenable number.

6449881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6449881 is an equidigital number, since it uses as much as digits as its factorization.

6449881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 6449881 is about 2539.6615916299. The cubic root of 6449881 is about 186.1446537267.

The spelling of 6449881 in words is "six million, four hundred forty-nine thousand, eight hundred eighty-one".