1312491333 has 4 divisors (see below), whose sum is σ = 1749988448. Its totient is φ = 874994220.

The previous prime is 1312491331. The next prime is 1312491337. The reversal of 1312491333 is 3331942131.

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.

It is not a de Polignac number, because 1312491333 - 2¹ = 1312491331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312491333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312491331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218748553 + ... + 218748558.

It is an arithmetic number, because the mean of its divisors is an integer number (437497112).

Almost surely, 2^1312491333 is an apocalyptic number.

It is an amenable number.

1312491333 is a deficient number, since it is larger than the sum of its proper divisors (437497115).

1312491333 is an equidigital number, since it uses as much as digits as its factorization.

1312491333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437497114.

The product of its digits is 5832, while the sum is 30.

The square root of 1312491333 is about 36228.3222493121. The cubic root of 1312491333 is about 1094.8773749798.

The spelling of 1312491333 in words is "one billion, three hundred twelve million, four hundred ninety-one thousand, three hundred thirty-three".