1001381 has 2 divisors, whose sum is σ = 1001382. Its totient is φ = 1001380.

The previous prime is 1001369. The next prime is 1001387. The reversal of 1001381 is 1831001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688900 + 312481 = 830^2 + 559^2 .

It is an emirp because it is prime and its reverse (1831001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001381 - 2¹⁰ = 1000357 is a prime.

It is a super-2 number, since 2×1001381² = 2005527814322, 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 (1001387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500690 + 500691.

It is an arithmetic number, because the mean of its divisors is an integer number (500691).

2^1001381 is an apocalyptic number.

It is an amenable number.

1001381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001381 is an equidigital number, since it uses as much as digits as its factorization.

1001381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1001381 is about 1000.6902617693. The cubic root of 1001381 is about 100.0460121589.

Adding to 1001381 its reverse (1831001), we get a palindrome (2832382).

The spelling of 1001381 in words is "one million, one thousand, three hundred eighty-one".