3581381 has 2 divisors, whose sum is σ = 3581382. Its totient is φ = 3581380.

The previous prime is 3581377. The next prime is 3581393. The reversal of 3581381 is 1831853.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2512225 + 1069156 = 1585^2 + 1034^2 .

It is an emirp because it is prime and its reverse (1831853) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3581381 - 2² = 3581377 is a prime.

It is a super-2 number, since 2×3581381² = 25652579734322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3581321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1790690 + 1790691.

It is an arithmetic number, because the mean of its divisors is an integer number (1790691).

Almost surely, 2^3581381 is an apocalyptic number.

It is an amenable number.

3581381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3581381 is an equidigital number, since it uses as much as digits as its factorization.

3581381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 3581381 is about 1892.4536982447. The cubic root of 3581381 is about 152.9972089997.

The spelling of 3581381 in words is "three million, five hundred eighty-one thousand, three hundred eighty-one".