2164945 has 4 divisors (see below), whose sum is σ = 2597940. Its totient is φ = 1731952.

The previous prime is 2164927. The next prime is 2164963. The reversal of 2164945 is 5494612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2164927) and next prime (2164963).

It can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 446224 = 1311^2 + 668^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164945 - 2⁷ = 2164817 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216490 + ... + 216499.

It is an arithmetic number, because the mean of its divisors is an integer number (649485).

2^2164945 is an apocalyptic number.

It is an amenable number.

2164945 is a deficient number, since it is larger than the sum of its proper divisors (432995).

2164945 is an equidigital number, since it uses as much as digits as its factorization.

2164945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432994.

The product of its digits is 8640, while the sum is 31.

The square root of 2164945 is about 1471.3752070767. The cubic root of 2164945 is about 129.3646514006.

The spelling of 2164945 in words is "two million, one hundred sixty-four thousand, nine hundred forty-five".