1818504641 has 4 divisors (see below), whose sum is σ = 1818854400. Its totient is φ = 1818154884.

The previous prime is 1818504629. The next prime is 1818504643. The reversal of 1818504641 is 1464058181.

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 1818504641 - 2⁶ = 1818504577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1818504595 and 1818504604.

It is not an unprimeable number, because it can be changed into a prime (1818504643) 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, 166961 + ... + 177518.

It is an arithmetic number, because the mean of its divisors is an integer number (454713600).

Almost surely, 2^1818504641 is an apocalyptic number.

It is an amenable number.

1818504641 is a deficient number, since it is larger than the sum of its proper divisors (349759).

1818504641 is an equidigital number, since it uses as much as digits as its factorization.

1818504641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349758.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 1818504641 is about 42643.9285361938. The cubic root of 1818504641 is about 1220.5946758196.

The spelling of 1818504641 in words is "one billion, eight hundred eighteen million, five hundred four thousand, six hundred forty-one".