1813242161 has 2 divisors, whose sum is σ = 1813242162. Its totient is φ = 1813242160.

The previous prime is 1813242157. The next prime is 1813242217. The reversal of 1813242161 is 1612423181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1813056400 + 185761 = 42580^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813242161 - 2² = 1813242157 is a prime.

It is not a weakly prime, because it can be changed into another prime (1813242121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906621080 + 906621081.

It is an arithmetic number, because the mean of its divisors is an integer number (906621081).

Almost surely, 2^1813242161 is an apocalyptic number.

It is an amenable number.

1813242161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813242161 is an equidigital number, since it uses as much as digits as its factorization.

1813242161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 1813242161 is about 42582.1812616498. The cubic root of 1813242161 is about 1219.4161321999.

The spelling of 1813242161 in words is "one billion, eight hundred thirteen million, two hundred forty-two thousand, one hundred sixty-one".