1861103 has 2 divisors, whose sum is σ = 1861104. Its totient is φ = 1861102.

The previous prime is 1861081. The next prime is 1861121. The reversal of 1861103 is 3011681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1861103 - 2⁶ = 1861039 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is equal to p₁₃₉₃₃₁ and since 1861103 and 139331 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930551 + 930552.

It is an arithmetic number, because the mean of its divisors is an integer number (930552).

2^1861103 is an apocalyptic number.

1861103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861103 is an equidigital number, since it uses as much as digits as its factorization.

1861103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1861103 is about 1364.2224891857. Note that the first 3 decimals coincide. The cubic root of 1861103 is about 123.0051995070.

Adding to 1861103 its reverse (3011681), we get a palindrome (4872784).

The spelling of 1861103 in words is "one million, eight hundred sixty-one thousand, one hundred three".