3331781 has 4 divisors (see below), whose sum is σ = 3446700. Its totient is φ = 3216864.

The previous prime is 3331763. The next prime is 3331799. The reversal of 3331781 is 1871333.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1871333 = 367 ⋅5099.

It is an interprime number because it is at equal distance from previous prime (3331763) and next prime (3331799).

It can be written as a sum of positive squares in 2 ways, for example, as 1809025 + 1522756 = 1345^2 + 1234^2 .

It is a cyclic number.

It is not a de Polignac number, because 3331781 - 2¹⁸ = 3069637 is a prime.

It is a super-2 number, since 2×3331781² = 22201529263922, which contains 22 as substring.

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 3331781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3331381) 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, 57416 + ... + 57473.

It is an arithmetic number, because the mean of its divisors is an integer number (861675).

Almost surely, 2^3331781 is an apocalyptic number.

It is an amenable number.

3331781 is a deficient number, since it is larger than the sum of its proper divisors (114919).

3331781 is a wasteful number, since it uses less digits than its factorization.

3331781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114918.

The product of its digits is 1512, while the sum is 26.

The square root of 3331781 is about 1825.3166848522. The cubic root of 3331781 is about 149.3569658381.

The spelling of 3331781 in words is "three million, three hundred thirty-one thousand, seven hundred eighty-one".