1237661 has 2 divisors, whose sum is σ = 1237662. Its totient is φ = 1237660.

The previous prime is 1237627. The next prime is 1237721. The reversal of 1237661 is 1667321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1012036 + 225625 = 1006^2 + 475^2 .

It is an emirp because it is prime and its reverse (1667321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1237661 is a prime.

It is a Chen prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1237661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1237961) 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 as a sum of consecutive naturals, namely, 618830 + 618831.

It is an arithmetic number, because the mean of its divisors is an integer number (618831).

2^1237661 is an apocalyptic number.

It is an amenable number.

1237661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1237661 is an equidigital number, since it uses as much as digits as its factorization.

1237661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 26.

The square root of 1237661 is about 1112.5021348294. The cubic root of 1237661 is about 107.3661141938.

It can be divided in two parts, 12 and 37661, that added together give a palindrome (37673).

The spelling of 1237661 in words is "one million, two hundred thirty-seven thousand, six hundred sixty-one".