1919913161 has 2 divisors, whose sum is σ = 1919913162. Its totient is φ = 1919913160.

The previous prime is 1919913119. The next prime is 1919913167. The reversal of 1919913161 is 1613199191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1913537536 + 6375625 = 43744^2 + 2525^2 .

It is an emirp because it is prime and its reverse (1613199191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1919913161 - 2¹⁴ = 1919896777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1919913167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959956580 + 959956581.

It is an arithmetic number, because the mean of its divisors is an integer number (959956581).

Almost surely, 2^1919913161 is an apocalyptic number.

It is an amenable number.

1919913161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919913161 is an equidigital number, since it uses as much as digits as its factorization.

1919913161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 41.

The square root of 1919913161 is about 43816.8136792259. The cubic root of 1919913161 is about 1242.8742639766.

The spelling of 1919913161 in words is "one billion, nine hundred nineteen million, nine hundred thirteen thousand, one hundred sixty-one".