1261549 has 2 divisors, whose sum is σ = 1261550. Its totient is φ = 1261548.

The previous prime is 1261531. The next prime is 1261567. The reversal of 1261549 is 9451621.

It is a balanced prime because it is at equal distance from previous prime (1261531) and next prime (1261567).

It can be written as a sum of positive squares in only one way, i.e., 1225449 + 36100 = 1107^2 + 190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630774 + 630775.

It is an arithmetic number, because the mean of its divisors is an integer number (630775).

2^1261549 is an apocalyptic number.

It is an amenable number.

1261549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261549 is an equidigital number, since it uses as much as digits as its factorization.

1261549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 1261549 is about 1123.1869835428. The cubic root of 1261549 is about 108.0524722158.

The spelling of 1261549 in words is "one million, two hundred sixty-one thousand, five hundred forty-nine".