2237561 has 2 divisors, whose sum is σ = 2237562. Its totient is φ = 2237560.

The previous prime is 2237551. The next prime is 2237563. The reversal of 2237561 is 1657322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1525225 + 712336 = 1235^2 + 844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2237561 is a prime.

It is a Sophie Germain prime.

Together with 2237563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 2237561.

It is not a weakly prime, because it can be changed into another prime (2237563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1118780 + 1118781.

It is an arithmetic number, because the mean of its divisors is an integer number (1118781).

2^2237561 is an apocalyptic number.

It is an amenable number.

2237561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2237561 is an equidigital number, since it uses as much as digits as its factorization.

2237561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 26.

The square root of 2237561 is about 1495.8479200774. The cubic root of 2237561 is about 130.7951462878.

The spelling of 2237561 in words is "two million, two hundred thirty-seven thousand, five hundred sixty-one".