2641649261 has 8 divisors (see below), whose sum is σ = 2801184120. Its totient is φ = 2482574848.

The previous prime is 2641649177. The next prime is 2641649279. The reversal of 2641649261 is 1629461462.

It can be written as a sum of positive squares in 4 ways, for example, as 702568036 + 1939081225 = 26506^2 + 44035^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2641649261 - 2¹⁰ = 2641648237 is a prime.

It is a super-2 number, since 2×2641649261² = 13956621636283692242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2641649281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103256 + ... + 126273.

It is an arithmetic number, because the mean of its divisors is an integer number (350148015).

Almost surely, 2^2641649261 is an apocalyptic number.

It is an amenable number.

2641649261 is a deficient number, since it is larger than the sum of its proper divisors (159534859).

2641649261 is a wasteful number, since it uses less digits than its factorization.

2641649261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230223.

The product of its digits is 124416, while the sum is 41.

The square root of 2641649261 is about 51396.9771581948. The cubic root of 2641649261 is about 1382.3723914320.

The spelling of 2641649261 in words is "two billion, six hundred forty-one million, six hundred forty-nine thousand, two hundred sixty-one".