1100381 has 2 divisors, whose sum is σ = 1100382. Its totient is φ = 1100380.

The previous prime is 1100377. The next prime is 1100387. The reversal of 1100381 is 1830011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912025 + 188356 = 955^2 + 434^2 .

It is an emirp because it is prime and its reverse (1830011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1100381 - 2² = 1100377 is a prime.

It is a super-2 number, since 2×1100381² = 2421676690322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550190 + 550191.

It is an arithmetic number, because the mean of its divisors is an integer number (550191).

2^1100381 is an apocalyptic number.

It is an amenable number.

1100381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100381 is an equidigital number, since it uses as much as digits as its factorization.

1100381 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 1100381 is about 1048.9904670682. The cubic root of 1100381 is about 103.2399283130.

Adding to 1100381 its reverse (1830011), we get a palindrome (2930392).

The spelling of 1100381 in words is "one million, one hundred thousand, three hundred eighty-one".