2618561 has 24 divisors (see below), whose sum is σ = 3255840. Its totient is φ = 2090880.

The previous prime is 2618543. The next prime is 2618579. The reversal of 2618561 is 1658162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2618543) and next prime (2618579).

It is not a de Polignac number, because 2618561 - 2¹⁴ = 2602177 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2618501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39050 + ... + 39116.

It is an arithmetic number, because the mean of its divisors is an integer number (135660).

2^2618561 is an apocalyptic number.

It is an amenable number.

2618561 is a deficient number, since it is larger than the sum of its proper divisors (637279).

2618561 is a wasteful number, since it uses less digits than its factorization.

2618561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 114 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 2618561 is about 1618.1968359875. The cubic root of 2618561 is about 137.8333246417.

The spelling of 2618561 in words is "two million, six hundred eighteen thousand, five hundred sixty-one".