3181393 has 4 divisors (see below), whose sum is σ = 3186868. Its totient is φ = 3175920.

The previous prime is 3181391. The next prime is 3181411. The reversal of 3181393 is 3931813.

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 2455489 + 725904 = 1567^2 + 852^2 .

It is a cyclic number.

It is not a de Polignac number, because 3181393 - 2¹ = 3181391 is a prime.

It is a super-2 number, since 2×3181393² = 20242522840898, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3181391) 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, 1746 + ... + 3067.

It is an arithmetic number, because the mean of its divisors is an integer number (796717).

Almost surely, 2^3181393 is an apocalyptic number.

It is an amenable number.

3181393 is a deficient number, since it is larger than the sum of its proper divisors (5475).

3181393 is an equidigital number, since it uses as much as digits as its factorization.

3181393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474.

The product of its digits is 1944, while the sum is 28.

The square root of 3181393 is about 1783.6459850542. The cubic root of 3181393 is about 147.0750846615.

It can be divided in two parts, 318 and 1393, that added together give a triangular number (1711 = T₅₈).

The spelling of 3181393 in words is "three million, one hundred eighty-one thousand, three hundred ninety-three".