1823921161 has 2 divisors, whose sum is σ = 1823921162. Its totient is φ = 1823921160.

The previous prime is 1823921159. The next prime is 1823921227. The reversal of 1823921161 is 1611293281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1378711161 + 445210000 = 37131^2 + 21100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1823921161 - 2¹ = 1823921159 is a prime.

Together with 1823921159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1823921461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911960580 + 911960581.

It is an arithmetic number, because the mean of its divisors is an integer number (911960581).

Almost surely, 2^1823921161 is an apocalyptic number.

It is an amenable number.

1823921161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1823921161 is an equidigital number, since it uses as much as digits as its factorization.

1823921161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 1823921161 is about 42707.3900045414. The cubic root of 1823921161 is about 1221.8053449311.

It can be divided in two parts, 182392 and 1161, that multiplied together give a palindrome (211757112).

The spelling of 1823921161 in words is "one billion, eight hundred twenty-three million, nine hundred twenty-one thousand, one hundred sixty-one".