2621961 has 12 divisors (see below), whose sum is σ = 4010292. Its totient is φ = 1645056.

The previous prime is 2621951. The next prime is 2621987. The reversal of 2621961 is 1691262.

It can be written as a sum of positive squares in 2 ways, for example, as 783225 + 1838736 = 885^2 + 1356^2 .

It is not a de Polignac number, because 2621961 - 2⁵ = 2621929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2621921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8416 + ... + 8721.

It is an arithmetic number, because the mean of its divisors is an integer number (334191).

2^2621961 is an apocalyptic number.

It is an amenable number.

2621961 is a deficient number, since it is larger than the sum of its proper divisors (1388331).

2621961 is a wasteful number, since it uses less digits than its factorization.

2621961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17160 (or 17157 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2621961 is about 1619.2470472414. The cubic root of 2621961 is about 137.8929541637.

The spelling of 2621961 in words is "two million, six hundred twenty-one thousand, nine hundred sixty-one".