1618843841 has 4 divisors (see below), whose sum is σ = 1619310000. Its totient is φ = 1618377684.

The previous prime is 1618843801. The next prime is 1618843847. The reversal of 1618843841 is 1483488161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1483488161 = 359 ⋅4132279.

It is a cyclic number.

It is not a de Polignac number, because 1618843841 - 2¹⁸ = 1618581697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1618843792 and 1618843801.

It is not an unprimeable number, because it can be changed into a prime (1618843847) 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, 227831 + ... + 234828.

It is an arithmetic number, because the mean of its divisors is an integer number (404827500).

Almost surely, 2^1618843841 is an apocalyptic number.

It is an amenable number.

1618843841 is a deficient number, since it is larger than the sum of its proper divisors (466159).

1618843841 is an equidigital number, since it uses as much as digits as its factorization.

1618843841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466158.

The product of its digits is 147456, while the sum is 44.

The square root of 1618843841 is about 40234.8585308809. The cubic root of 1618843841 is about 1174.1808302126.

The spelling of 1618843841 in words is "one billion, six hundred eighteen million, eight hundred forty-three thousand, eight hundred forty-one".