1819107801 has 45 divisors (see below), whose sum is σ = 3165771279. Its totient is φ = 1037954736.

The previous prime is 1819107781. The next prime is 1819107809. The reversal of 1819107801 is 1087019181.

It is a happy number.

The square root of 1819107801 is 42651.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1808375625 + 10732176 = 42525^2 + 3276^2 .

It is not a de Polignac number, because 1819107801 - 2⁵ = 1819107769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1819107809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2686675 + ... + 2687351.

Almost surely, 2^1819107801 is an apocalyptic number.

1819107801 is the 42651-st square number.

1819107801 is the 21326-th centered octagonal number.

It is an amenable number.

1819107801 is a deficient number, since it is larger than the sum of its proper divisors (1346663478).

1819107801 is an frugal number, since it uses more digits than its factorization.

1819107801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 36.

The cubic root of 1819107801 is about 1220.7296094875.

Multiplying 1819107801 by its sum of digits (36), we get a square (65487880836 = 255906²).

The spelling of 1819107801 in words is "one billion, eight hundred nineteen million, one hundred seven thousand, eight hundred one".