1618081 has 2 divisors, whose sum is σ = 1618082. Its totient is φ = 1618080.

The previous prime is 1618079. The next prime is 1618087. The reversal of 1618081 is 1808161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1401856 + 216225 = 1184^2 + 465^2 .

It is an emirp because it is prime and its reverse (1808161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1618081 - 2¹ = 1618079 is a prime.

It is a super-2 number, since 2×1618081² = 5236372245122, which contains 22 as substring.

Together with 1618079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1618087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809040 + 809041.

It is an arithmetic number, because the mean of its divisors is an integer number (809041).

2^1618081 is an apocalyptic number.

It is an amenable number.

1618081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618081 is an equidigital number, since it uses as much as digits as its factorization.

1618081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 1618081 is about 1272.0381283594. The cubic root of 1618081 is about 117.3996366464.

It can be divided in two parts, 16180 and 81, that added together give a palindrome (16261).

The spelling of 1618081 in words is "one million, six hundred eighteen thousand, eighty-one".