2515661 has 4 divisors (see below), whose sum is σ = 2529024. Its totient is φ = 2502300.

The previous prime is 2515651. The next prime is 2515673. The reversal of 2515661 is 1665152.

2515661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2515661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2515661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2515621) 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 3 ways as a sum of consecutive naturals, for example, 6395 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (632256).

2^2515661 is an apocalyptic number.

It is an amenable number.

2515661 is a deficient number, since it is larger than the sum of its proper divisors (13363).

2515661 is a wasteful number, since it uses less digits than its factorization.

2515661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13362.

The product of its digits is 1800, while the sum is 26.

The square root of 2515661 is about 1586.0835413054. The cubic root of 2515661 is about 136.0036943921.

The spelling of 2515661 in words is "two million, five hundred fifteen thousand, six hundred sixty-one".