1799911121 has 4 divisors (see below), whose sum is σ = 1815839652. Its totient is φ = 1783982592.

The previous prime is 1799911117. The next prime is 1799911123. The reversal of 1799911121 is 1211199971.

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 2 ways, for example, as 499299025 + 1300612096 = 22345^2 + 36064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1799911121 - 2² = 1799911117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1799911123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7964096 + ... + 7964321.

It is an arithmetic number, because the mean of its divisors is an integer number (453959913).

Almost surely, 2^1799911121 is an apocalyptic number.

It is an amenable number.

1799911121 is a deficient number, since it is larger than the sum of its proper divisors (15928531).

1799911121 is a wasteful number, since it uses less digits than its factorization.

1799911121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15928530.

The product of its digits is 10206, while the sum is 41.

The square root of 1799911121 is about 42425.3594092024. The cubic root of 1799911121 is about 1216.4203773025.

The spelling of 1799911121 in words is "one billion, seven hundred ninety-nine million, nine hundred eleven thousand, one hundred twenty-one".