2518561 has 2 divisors, whose sum is σ = 2518562. Its totient is φ = 2518560.

The previous prime is 2518559. The next prime is 2518577. The reversal of 2518561 is 1658152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1742400 + 776161 = 1320^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 2518561 - 2¹ = 2518559 is a prime.

Together with 2518559, it forms a pair of twin primes.

2518561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2518501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1259280 + 1259281.

It is an arithmetic number, because the mean of its divisors is an integer number (1259281).

2^2518561 is an apocalyptic number.

It is an amenable number.

2518561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2518561 is an equidigital number, since it uses as much as digits as its factorization.

2518561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 28.

The square root of 2518561 is about 1586.9974795191. The cubic root of 2518561 is about 136.0559350365.

The spelling of 2518561 in words is "two million, five hundred eighteen thousand, five hundred sixty-one".