1819797109 has 8 divisors (see below), whose sum is σ = 2005358432. Its totient is φ = 1640746800.

The previous prime is 1819797103. The next prime is 1819797127. The reversal of 1819797109 is 9017979181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1819797109 - 2³ = 1819797101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1819797101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1627167 + ... + 1628284.

It is an arithmetic number, because the mean of its divisors is an integer number (250669804).

Almost surely, 2^1819797109 is an apocalyptic number.

It is an amenable number.

1819797109 is a deficient number, since it is larger than the sum of its proper divisors (185561323).

1819797109 is a wasteful number, since it uses less digits than its factorization.

1819797109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255507.

The product of its (nonzero) digits is 285768, while the sum is 52.

The square root of 1819797109 is about 42659.0800299303. The cubic root of 1819797109 is about 1220.8837789150.

The spelling of 1819797109 in words is "one billion, eight hundred nineteen million, seven hundred ninety-seven thousand, one hundred nine".