1919161 has 2 divisors, whose sum is σ = 1919162. Its totient is φ = 1919160.

The previous prime is 1919149. The next prime is 1919231. The reversal of 1919161 is 1619191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279161 + 640000 = 1131^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1919161 - 2⁹ = 1918649 is a prime.

1919161 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1919461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959580 + 959581.

It is an arithmetic number, because the mean of its divisors is an integer number (959581).

2^1919161 is an apocalyptic number.

It is an amenable number.

1919161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919161 is an equidigital number, since it uses as much as digits as its factorization.

1919161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 28.

The square root of 1919161 is about 1385.3378649268. The cubic root of 1919161 is about 124.2711936556.

It can be divided in two parts, 1919 and 161, that added together give a triangular number (2080 = T₆₄).

The spelling of 1919161 in words is "one million, nine hundred nineteen thousand, one hundred sixty-one".