6449911261 has 4 divisors (see below), whose sum is σ = 6450097500. Its totient is φ = 6449725024.

The previous prime is 6449911201. The next prime is 6449911271. The reversal of 6449911261 is 1621199446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1621199446 = 2 ⋅810599723.

It can be written as a sum of positive squares in 2 ways, for example, as 958212025 + 5491699236 = 30955^2 + 74106^2 .

It is a cyclic number.

It is not a de Polignac number, because 6449911261 - 2¹⁷ = 6449780189 is a prime.

It is a super-2 number, since 2×6449911261² = 83202710549549220242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6449911201) 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 3 ways as a sum of consecutive naturals, for example, 24136 + ... + 116113.

It is an arithmetic number, because the mean of its divisors is an integer number (1612524375).

Almost surely, 2^6449911261 is an apocalyptic number.

It is an amenable number.

6449911261 is a deficient number, since it is larger than the sum of its proper divisors (186239).

6449911261 is a wasteful number, since it uses less digits than its factorization.

6449911261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186238.

The product of its digits is 93312, while the sum is 43.

The square root of 6449911261 is about 80311.3395542622. The cubic root of 6449911261 is about 1861.4494483880.

The spelling of 6449911261 in words is "six billion, four hundred forty-nine million, nine hundred eleven thousand, two hundred sixty-one".