1861101 has 18 divisors (see below), whose sum is σ = 2956590. Its totient is φ = 1127280.

The previous prime is 1861081. The next prime is 1861103. The reversal of 1861101 is 1011681.

1861101 = 59² + 60² + ... + 179².

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 527076 = 1155^2 + 726^2 .

It is not a de Polignac number, because 1861101 - 2¹³ = 1852909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 235 + ... + 1943.

It is an arithmetic number, because the mean of its divisors is an integer number (164255).

2^1861101 is an apocalyptic number.

1861101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1861101 is a deficient number, since it is larger than the sum of its proper divisors (1095489).

1861101 is a wasteful number, since it uses less digits than its factorization.

1861101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737 (or 1723 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 1861101 is about 1364.2217561672. The cubic root of 1861101 is about 123.0051554452.

Adding to 1861101 its reverse (1011681), we get a palindrome (2872782).

The spelling of 1861101 in words is "one million, eight hundred sixty-one thousand, one hundred one".