1913313 has 4 divisors (see below), whose sum is σ = 2551088. Its totient is φ = 1275540.

The previous prime is 1913297. The next prime is 1913341. The reversal of 1913313 is 3133191.

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: 3133191 = 3 ⋅1044397.

It is not a de Polignac number, because 1913313 - 2⁴ = 1913297 is a prime.

It is a D-number.

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 1913313.

It is not an unprimeable number, because it can be changed into a prime (1913213) 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, 318883 + ... + 318888.

It is an arithmetic number, because the mean of its divisors is an integer number (637772).

2^1913313 is an apocalyptic number.

It is an amenable number.

1913313 is a deficient number, since it is larger than the sum of its proper divisors (637775).

1913313 is an equidigital number, since it uses as much as digits as its factorization.

1913313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637774.

The product of its digits is 243, while the sum is 21.

The square root of 1913313 is about 1383.2255781325. The cubic root of 1913313 is about 124.1448402897.

The spelling of 1913313 in words is "one million, nine hundred thirteen thousand, three hundred thirteen".