1618186441 has 4 divisors (see below), whose sum is σ = 1620024084. Its totient is φ = 1616348800.

The previous prime is 1618186439. The next prime is 1618186481. The reversal of 1618186441 is 1446818161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146313216 + 1471873225 = 12096^2 + 38365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618186441 - 2¹ = 1618186439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1618186394 and 1618186403.

It is not an unprimeable number, because it can be changed into a prime (1618186411) 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 3 ways as a sum of consecutive naturals, for example, 917500 + ... + 919261.

It is an arithmetic number, because the mean of its divisors is an integer number (405006021).

Almost surely, 2^1618186441 is an apocalyptic number.

It is an amenable number.

1618186441 is a deficient number, since it is larger than the sum of its proper divisors (1837643).

1618186441 is an equidigital number, since it uses as much as digits as its factorization.

1618186441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837642.

The product of its digits is 36864, while the sum is 40.

The square root of 1618186441 is about 40226.6881684287. The cubic root of 1618186441 is about 1174.0218667659.

The spelling of 1618186441 in words is "one billion, six hundred eighteen million, one hundred eighty-six thousand, four hundred forty-one".