1103981 has 2 divisors, whose sum is σ = 1103982. Its totient is φ = 1103980.

The previous prime is 1103933. The next prime is 1103987. The reversal of 1103981 is 1893011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749956 + 354025 = 866^2 + 595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1103981 is a prime.

It is a super-2 number, since 2×1103981² = 2437548096722, which contains 22 as substring.

It is a Sophie Germain 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 (1103987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551990 + 551991.

It is an arithmetic number, because the mean of its divisors is an integer number (551991).

2^1103981 is an apocalyptic number.

It is an amenable number.

1103981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103981 is an equidigital number, since it uses as much as digits as its factorization.

1103981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1103981 is about 1050.7050014157. The cubic root of 1103981 is about 103.3523921373.

Adding to 1103981 its reverse (1893011), we get a palindrome (2996992).

The spelling of 1103981 in words is "one million, one hundred three thousand, nine hundred eighty-one".