1818822641 has 2 divisors, whose sum is σ = 1818822642. Its totient is φ = 1818822640.

The previous prime is 1818822631. The next prime is 1818822659. The reversal of 1818822641 is 1462288181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1320595600 + 498227041 = 36340^2 + 22321^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818822641 - 2¹⁴ = 1818806257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1818822631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909411320 + 909411321.

It is an arithmetic number, because the mean of its divisors is an integer number (909411321).

Almost surely, 2^1818822641 is an apocalyptic number.

It is an amenable number.

1818822641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818822641 is an equidigital number, since it uses as much as digits as its factorization.

1818822641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49152, while the sum is 41.

The square root of 1818822641 is about 42647.6569227431. The cubic root of 1818822641 is about 1220.6658197099.

The spelling of 1818822641 in words is "one billion, eight hundred eighteen million, eight hundred twenty-two thousand, six hundred forty-one".