3318781 has 4 divisors (see below), whose sum is σ = 3328192. Its totient is φ = 3309372.

The previous prime is 3318769. The next prime is 3318793. The reversal of 3318781 is 1878133.

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: 1878133 = 137 ⋅13709.

It is an interprime number because it is at equal distance from previous prime (3318769) and next prime (3318793).

It is a cyclic number.

It is not a de Polignac number, because 3318781 - 2¹³ = 3310589 is a prime.

It is a super-2 number, since 2×3318781² = 22028614651922, which contains 22 as substring.

It is a Duffinian number.

3318781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3312781) 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, 4155 + ... + 4888.

It is an arithmetic number, because the mean of its divisors is an integer number (832048).

Almost surely, 2^3318781 is an apocalyptic number.

It is an amenable number.

3318781 is a deficient number, since it is larger than the sum of its proper divisors (9411).

3318781 is an equidigital number, since it uses as much as digits as its factorization.

3318781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410.

The product of its digits is 4032, while the sum is 31.

The square root of 3318781 is about 1821.7521785358. The cubic root of 3318781 is about 149.1624581205.

The spelling of 3318781 in words is "three million, three hundred eighteen thousand, seven hundred eighty-one".