2161919 has 2 divisors, whose sum is σ = 2161920. Its totient is φ = 2161918.

The previous prime is 2161903. The next prime is 2161927. The reversal of 2161919 is 9191612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2161919 - 2⁴ = 2161903 is a prime.

It is a super-2 number, since 2×2161919² = 9347787525122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2161891 and 2161900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080959 + 1080960.

It is an arithmetic number, because the mean of its divisors is an integer number (1080960).

2^2161919 is an apocalyptic number.

2161919 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161919 is an equidigital number, since it uses as much as digits as its factorization.

2161919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 29.

The square root of 2161919 is about 1470.3465577883. The cubic root of 2161919 is about 129.3043511835.

The spelling of 2161919 in words is "two million, one hundred sixty-one thousand, nine hundred nineteen".