4012561 has 12 divisors (see below), whose sum is σ = 4943268. Its totient is φ = 3236352.

The previous prime is 4012549. The next prime is 4012573. The reversal of 4012561 is 1652104.

4012561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (4012549) and next prime (4012573).

It can be written as a sum of positive squares in 2 ways, for example, as 1640961 + 2371600 = 1281^2 + 1540^2 .

It is not a de Polignac number, because 4012561 - 2¹⁹ = 3488273 is a prime.

It is a super-2 number, since 2×4012561² = 32201291557442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4012861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1576 + ... + 3241.

It is an arithmetic number, because the mean of its divisors is an integer number (411939).

Almost surely, 2^4012561 is an apocalyptic number.

It is an amenable number.

4012561 is a deficient number, since it is larger than the sum of its proper divisors (930707).

4012561 is a wasteful number, since it uses less digits than its factorization.

4012561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4848 (or 4841 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 4012561 is about 2003.1377885707. The cubic root of 4012561 is about 158.9060927755.

Adding to 4012561 its reverse (1652104), we get a palindrome (5664665).

It can be divided in two parts, 40125 and 61, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 4012561 in words is "four million, twelve thousand, five hundred sixty-one".