1260991 has 2 divisors, whose sum is σ = 1260992. Its totient is φ = 1260990.

The previous prime is 1260989. The next prime is 1261033. The reversal of 1260991 is 1990621.

It is a weak prime.

It is an emirp because it is prime and its reverse (1990621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1260991 - 2¹ = 1260989 is a prime.

Together with 1260989, it forms a pair of twin primes.

It is a Chen prime.

1260991 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1260901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630495 + 630496.

It is an arithmetic number, because the mean of its divisors is an integer number (630496).

2^1260991 is an apocalyptic number.

1260991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1260991 is an equidigital number, since it uses as much as digits as its factorization.

1260991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1260991 is about 1122.9385557545. The cubic root of 1260991 is about 108.0365388484.

The spelling of 1260991 in words is "one million, two hundred sixty thousand, nine hundred ninety-one".