1919161117 has 2 divisors, whose sum is σ = 1919161118. Its totient is φ = 1919161116.

The previous prime is 1919161099. The next prime is 1919161171. The reversal of 1919161117 is 7111619191.

Together with next prime (1919161171) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1092368601 + 826792516 = 33051^2 + 28754^2 .

It is an emirp because it is prime and its reverse (7111619191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1919161117 - 2¹¹ = 1919159069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1919161187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959580558 + 959580559.

It is an arithmetic number, because the mean of its divisors is an integer number (959580559).

Almost surely, 2^1919161117 is an apocalyptic number.

It is an amenable number.

1919161117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919161117 is an equidigital number, since it uses as much as digits as its factorization.

1919161117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 37.

The square root of 1919161117 is about 43808.2311557999. The cubic root of 1919161117 is about 1242.7119618091.

It can be divided in two parts, 19191 and 61117, that added together give a palindrome (80308).

The spelling of 1919161117 in words is "one billion, nine hundred nineteen million, one hundred sixty-one thousand, one hundred seventeen".