1252661 has 2 divisors, whose sum is σ = 1252662. Its totient is φ = 1252660.

The previous prime is 1252639. The next prime is 1252663. The reversal of 1252661 is 1662521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1168561 + 84100 = 1081^2 + 290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252661 is a prime.

Together with 1252663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252663) 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, 626330 + 626331.

It is an arithmetic number, because the mean of its divisors is an integer number (626331).

2^1252661 is an apocalyptic number.

It is an amenable number.

1252661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252661 is an equidigital number, since it uses as much as digits as its factorization.

1252661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 1252661 is about 1119.2233914639. The cubic root of 1252661 is about 107.7981196671.

The spelling of 1252661 in words is "one million, two hundred fifty-two thousand, six hundred sixty-one".