1291249 has 2 divisors, whose sum is σ = 1291250. Its totient is φ = 1291248.

The previous prime is 1291229. The next prime is 1291271. The reversal of 1291249 is 9421921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651249 + 640000 = 807^2 + 800^2 .

It is an emirp because it is prime and its reverse (9421921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291249 - 2⁵ = 1291217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645624 + 645625.

It is an arithmetic number, because the mean of its divisors is an integer number (645625).

2^1291249 is an apocalyptic number.

It is an amenable number.

1291249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291249 is an equidigital number, since it uses as much as digits as its factorization.

1291249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 1291249 is about 1136.3313777239. The cubic root of 1291249 is about 108.8938449701.

It can be divided in two parts, 1291 and 249, that added together give a triangular number (1540 = T₅₅).

The spelling of 1291249 in words is "one million, two hundred ninety-one thousand, two hundred forty-nine".