1291057 has 4 divisors (see below), whose sum is σ = 1332736. Its totient is φ = 1249380.

The previous prime is 1291021. The next prime is 1291063. The reversal of 1291057 is 7501921.

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: 7501921 = 7 ⋅1071703.

It is a cyclic number.

It is not a de Polignac number, because 1291057 - 2¹¹ = 1289009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291007) 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, 20793 + ... + 20854.

It is an arithmetic number, because the mean of its divisors is an integer number (333184).

2^1291057 is an apocalyptic number.

It is an amenable number.

1291057 is a deficient number, since it is larger than the sum of its proper divisors (41679).

1291057 is an equidigital number, since it uses as much as digits as its factorization.

1291057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41678.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 1291057 is about 1136.2468921850. The cubic root of 1291057 is about 108.8884474429. Note that the first 3 decimals are identical.

Adding to 1291057 its reverse (7501921), we get a palindrome (8792978).

The spelling of 1291057 in words is "one million, two hundred ninety-one thousand, fifty-seven".