1291049 has 4 divisors (see below), whose sum is σ = 1322580. Its totient is φ = 1259520.

The previous prime is 1291021. The next prime is 1291063. The reversal of 1291049 is 9401921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 354025 + 937024 = 595^2 + 968^2 .

It is not a de Polignac number, because 1291049 - 2¹² = 1286953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291009) 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, 15704 + ... + 15785.

It is an arithmetic number, because the mean of its divisors is an integer number (330645).

2^1291049 is an apocalyptic number.

It is an amenable number.

1291049 is a deficient number, since it is larger than the sum of its proper divisors (31531).

1291049 is an equidigital number, since it uses as much as digits as its factorization.

1291049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31530.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1291049 is about 1136.2433718179. The cubic root of 1291049 is about 108.8882225344. Note that the first 3 decimals are identical.

The spelling of 1291049 in words is "one million, two hundred ninety-one thousand, forty-nine".