1003381 has 2 divisors, whose sum is σ = 1003382. Its totient is φ = 1003380.

The previous prime is 1003369. The next prime is 1003397. The reversal of 1003381 is 1833001.

It is an a-pointer prime, because the next prime (1003397) can be obtained adding 1003381 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 933156 + 70225 = 966^2 + 265^2 .

It is an emirp because it is prime and its reverse (1833001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1003381 - 2⁵ = 1003349 is a prime.

It is a super-2 number, since 2×1003381² = 2013546862322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1003351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501690 + 501691.

It is an arithmetic number, because the mean of its divisors is an integer number (501691).

2^1003381 is an apocalyptic number.

It is an amenable number.

1003381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1003381 is an equidigital number, since it uses as much as digits as its factorization.

1003381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1003381 is about 1001.6890735153. The cubic root of 1003381 is about 100.1125732251.

Adding to 1003381 its reverse (1833001), we get a palindrome (2836382).

It can be divided in two parts, 100 and 3381, that added together give a square (3481 = 59²).

The spelling of 1003381 in words is "one million, three thousand, three hundred eighty-one".