1821934161 has 8 divisors (see below), whose sum is σ = 2699161760. Its totient is φ = 1214622756.

The previous prime is 1821934157. The next prime is 1821934181. The reversal of 1821934161 is 1614391281.

It is not a de Polignac number, because 1821934161 - 2² = 1821934157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821934151) 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, 33739495 + ... + 33739548.

It is an arithmetic number, because the mean of its divisors is an integer number (337395220).

Almost surely, 2^1821934161 is an apocalyptic number.

It is an amenable number.

1821934161 is a deficient number, since it is larger than the sum of its proper divisors (877227599).

1821934161 is an equidigital number, since it uses as much as digits as its factorization.

1821934161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67479052 (or 67479046 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1821934161 is about 42684.1207125085. The cubic root of 1821934161 is about 1221.3615009383.

The spelling of 1821934161 in words is "one billion, eight hundred twenty-one million, nine hundred thirty-four thousand, one hundred sixty-one".