1019880161 has 2 divisors, whose sum is σ = 1019880162. Its totient is φ = 1019880160.

The previous prime is 1019880143. The next prime is 1019880163. The reversal of 1019880161 is 1610889101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000520161 + 19360000 = 31631^2 + 4400^2 .

It is an emirp because it is prime and its reverse (1610889101) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1910886101 and 1016880191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1019880161 is a prime.

It is a Sophie Germain prime.

Together with 1019880163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1019880163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509940080 + 509940081.

It is an arithmetic number, because the mean of its divisors is an integer number (509940081).

Almost surely, 2^1019880161 is an apocalyptic number.

It is an amenable number.

1019880161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019880161 is an equidigital number, since it uses as much as digits as its factorization.

1019880161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 35.

The square root of 1019880161 is about 31935.5626379120. The cubic root of 1019880161 is about 1006.5832855786.

The spelling of 1019880161 in words is "one billion, nineteen million, eight hundred eighty thousand, one hundred sixty-one".