1819852641 has 24 divisors (see below), whose sum is σ = 2642214120. Its totient is φ = 1207008000.

The previous prime is 1819852633. The next prime is 1819852663. The reversal of 1819852641 is 1462589181.

It is a happy number.

1819852641 is a `hidden beast` number, since 1 + 81 + 9 + 8 + 526 + 41 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1127952225 + 691900416 = 33585^2 + 26304^2 .

It is not a de Polignac number, because 1819852641 - 2³ = 1819852633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1819851641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2752851 + ... + 2753511.

It is an arithmetic number, because the mean of its divisors is an integer number (110092255).

Almost surely, 2^1819852641 is an apocalyptic number.

It is an amenable number.

1819852641 is a deficient number, since it is larger than the sum of its proper divisors (822361479).

1819852641 is a wasteful number, since it uses less digits than its factorization.

1819852641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777 (or 1774 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 1819852641 is about 42659.7309063243. The cubic root of 1819852641 is about 1220.8961974108.

The spelling of 1819852641 in words is "one billion, eight hundred nineteen million, eight hundred fifty-two thousand, six hundred forty-one".