1816061 has 4 divisors (see below), whose sum is σ = 1955772. Its totient is φ = 1676352.

The previous prime is 1816051. The next prime is 1816063. The reversal of 1816061 is 1606181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1606181 = 389 ⋅4129.

It can be written as a sum of positive squares in 2 ways, for example, as 755161 + 1060900 = 869^2 + 1030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1816061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69836 + ... + 69861.

It is an arithmetic number, because the mean of its divisors is an integer number (488943).

2^1816061 is an apocalyptic number.

It is an amenable number.

1816061 is a deficient number, since it is larger than the sum of its proper divisors (139711).

1816061 is a wasteful number, since it uses less digits than its factorization.

1816061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139710.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1816061 is about 1347.6130750330. The cubic root of 1816061 is about 122.0047700366.

The spelling of 1816061 in words is "one million, eight hundred sixteen thousand, sixty-one".