2161967 has 2 divisors, whose sum is σ = 2161968. Its totient is φ = 2161966.

The previous prime is 2161963. The next prime is 2161987. The reversal of 2161967 is 7691612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161967 - 2² = 2161963 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080983 + 1080984.

It is an arithmetic number, because the mean of its divisors is an integer number (1080984).

2^2161967 is an apocalyptic number.

2161967 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161967 is an equidigital number, since it uses as much as digits as its factorization.

2161967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 2161967 is about 1470.3628803802. The cubic root of 2161967 is about 129.3053081363.

The spelling of 2161967 in words is "two million, one hundred sixty-one thousand, nine hundred sixty-seven".