1829919121 has 4 divisors (see below), whose sum is σ = 1850480100. Its totient is φ = 1809358144.

The previous prime is 1829919079. The next prime is 1829919167. The reversal of 1829919121 is 1219199281.

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 1206867600 + 623051521 = 34740^2 + 24961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1829919121 - 2¹⁵ = 1829886353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1829919191) 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, 10280356 + ... + 10280533.

It is an arithmetic number, because the mean of its divisors is an integer number (462620025).

Almost surely, 2^1829919121 is an apocalyptic number.

It is an amenable number.

1829919121 is a deficient number, since it is larger than the sum of its proper divisors (20560979).

1829919121 is an equidigital number, since it uses as much as digits as its factorization.

1829919121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20560978.

The product of its digits is 23328, while the sum is 43.

The square root of 1829919121 is about 42777.5539389526. The cubic root of 1829919121 is about 1223.1431807455.

The spelling of 1829919121 in words is "one billion, eight hundred twenty-nine million, nine hundred nineteen thousand, one hundred twenty-one".