1291433 has 12 divisors (see below), whose sum is σ = 1530564. Its totient is φ = 1082400.

The previous prime is 1291421. The next prime is 1291447. The reversal of 1291433 is 3341921.

It can be written as a sum of positive squares in 2 ways, for example, as 267289 + 1024144 = 517^2 + 1012^2 .

It is not a de Polignac number, because 1291433 - 2⁶ = 1291369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1291399 and 1291408.

It is not an unprimeable number, because it can be changed into a prime (1291453) 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 11 ways as a sum of consecutive naturals, for example, 1163 + ... + 1983.

It is an arithmetic number, because the mean of its divisors is an integer number (127547).

2^1291433 is an apocalyptic number.

1291433 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1291433 is a deficient number, since it is larger than the sum of its proper divisors (239131).

1291433 is a wasteful number, since it uses less digits than its factorization.

1291433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856 (or 845 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 1291433 is about 1136.4123371382. The cubic root of 1291433 is about 108.8990170982.

The spelling of 1291433 in words is "one million, two hundred ninety-one thousand, four hundred thirty-three".