1291081 has 4 divisors (see below), whose sum is σ = 1408464. Its totient is φ = 1173700.

The previous prime is 1291079. The next prime is 1291111. The reversal of 1291081 is 1801921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1801921 = 11 ⋅163811.

It is not a de Polignac number, because 1291081 - 2¹ = 1291079 is a prime.

It is a super-2 number, since 2×1291081² = 3333780297122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1291081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1291001) 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, 58675 + ... + 58696.

It is an arithmetic number, because the mean of its divisors is an integer number (352116).

2^1291081 is an apocalyptic number.

1291081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1291081 is a deficient number, since it is larger than the sum of its proper divisors (117383).

1291081 is a wasteful number, since it uses less digits than its factorization.

1291081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117382.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1291081 is about 1136.2574532209. The cubic root of 1291081 is about 108.8891221631.

The spelling of 1291081 in words is "one million, two hundred ninety-one thousand, eighty-one".