1797639161 has 2 divisors, whose sum is σ = 1797639162. Its totient is φ = 1797639160.

The previous prime is 1797639157. The next prime is 1797639203. The reversal of 1797639161 is 1619367971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1395396025 + 402243136 = 37355^2 + 20056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1797639161 - 2² = 1797639157 is a prime.

It is not a weakly prime, because it can be changed into another prime (1797609161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 898819580 + 898819581.

It is an arithmetic number, because the mean of its divisors is an integer number (898819581).

Almost surely, 2^1797639161 is an apocalyptic number.

It is an amenable number.

1797639161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1797639161 is an equidigital number, since it uses as much as digits as its factorization.

1797639161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 428652, while the sum is 50.

The square root of 1797639161 is about 42398.5749878460. The cubic root of 1797639161 is about 1215.9083479315.

The spelling of 1797639161 in words is "one billion, seven hundred ninety-seven million, six hundred thirty-nine thousand, one hundred sixty-one".