1816933641 has 4 divisors (see below), whose sum is σ = 2422578192. Its totient is φ = 1211289092.

The previous prime is 1816933627. The next prime is 1816933673. The reversal of 1816933641 is 1463396181.

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.

It is a cyclic number.

It is not a de Polignac number, because 1816933641 - 2⁵ = 1816933609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1816933593 and 1816933602.

It is not an unprimeable number, because it can be changed into a prime (1816935641) 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, 302822271 + ... + 302822276.

It is an arithmetic number, because the mean of its divisors is an integer number (605644548).

Almost surely, 2^1816933641 is an apocalyptic number.

It is an amenable number.

1816933641 is a deficient number, since it is larger than the sum of its proper divisors (605644551).

1816933641 is an equidigital number, since it uses as much as digits as its factorization.

1816933641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605644550.

The product of its digits is 93312, while the sum is 42.

The square root of 1816933641 is about 42625.5045835237. The cubic root of 1816933641 is about 1220.2430853522.

The spelling of 1816933641 in words is "one billion, eight hundred sixteen million, nine hundred thirty-three thousand, six hundred forty-one".