1818616522 has 4 divisors (see below), whose sum is σ = 2727924786. Its totient is φ = 909308260.

The previous prime is 1818616487. The next prime is 1818616529. The reversal of 1818616522 is 2256168181.

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 only one way, i.e., 1590334641 + 228281881 = 39879^2 + 15109^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1818616529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454654129 + ... + 454654132.

Almost surely, 2^1818616522 is an apocalyptic number.

1818616522 is a deficient number, since it is larger than the sum of its proper divisors (909308264).

1818616522 is an equidigital number, since it uses as much as digits as its factorization.

1818616522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909308263.

The product of its digits is 46080, while the sum is 40.

The square root of 1818616522 is about 42645.2403205797. The cubic root of 1818616522 is about 1220.6197071099.

The spelling of 1818616522 in words is "one billion, eight hundred eighteen million, six hundred sixteen thousand, five hundred twenty-two".