2165957 has 2 divisors, whose sum is σ = 2165958. Its totient is φ = 2165956.

The previous prime is 2165941. The next prime is 2165959. The reversal of 2165957 is 7595612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2163841 + 2116 = 1471^2 + 46^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165957 - 2⁴ = 2165941 is a prime.

Together with 2165959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082978 + 1082979.

It is an arithmetic number, because the mean of its divisors is an integer number (1082979).

2^2165957 is an apocalyptic number.

It is an amenable number.

2165957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165957 is an equidigital number, since it uses as much as digits as its factorization.

2165957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 2165957 is about 1471.7190628649. The cubic root of 2165957 is about 129.3848053589.

The spelling of 2165957 in words is "two million, one hundred sixty-five thousand, nine hundred fifty-seven".