1291156 has 12 divisors (see below), whose sum is σ = 2298240.
Its totient is φ = 634520.
The previous prime is 1291153. The next prime is 1291159. The reversal of 1291156 is 6511921.
It is an interprime number because it is at equal distance from previous prime (1291153) and next prime (1291159).
It is a self number, because there is not a number n which added to its sum of digits gives 1291156.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1291153) 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 in 3 ways as a sum of consecutive naturals, for example, 2500 + ... + 2971.
It is an arithmetic number, because the mean of its divisors is an integer number (191520).
21291156 is an apocalyptic number.
It is an amenable number.
1291156 is a deficient number, since it is larger than the sum of its proper divisors (1007084).
1291156 is a wasteful number, since it uses less digits than its factorization.
1291156 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5534 (or 5532 counting only the distinct ones).
The product of its digits is 540, while the sum is 25.
The square root of 1291156 is about 1136.2904558254.
The cubic root of 1291156 is about 108.8912306097.
The spelling of 1291156 in words is "one million, two hundred ninety-one thousand, one hundred fifty-six".