2061521 has 16 divisors (see below), whose sum is σ = 2636928. Its totient is φ = 1564800.

The previous prime is 2061503. The next prime is 2061533. The reversal of 2061521 is 1251602.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2061521 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2061521.

It is not an unprimeable number, because it can be changed into a prime (2061551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2831 + ... + 3483.

It is an arithmetic number, because the mean of its divisors is an integer number (164808).

2^2061521 is an apocalyptic number.

It is an amenable number.

2061521 is a deficient number, since it is larger than the sum of its proper divisors (575407).

2061521 is a wasteful number, since it uses less digits than its factorization.

2061521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2061521 is about 1435.7997771277. The cubic root of 2061521 is about 127.2709407758.

It can be divided in two parts, 20615 and 21, that multiplied together give a triangular number (432915 = T₉₃₀).

The spelling of 2061521 in words is "two million, sixty-one thousand, five hundred twenty-one".