2163949 has 2 divisors, whose sum is σ = 2163950. Its totient is φ = 2163948.

The previous prime is 2163923. The next prime is 2163971. The reversal of 2163949 is 9493612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 499849 = 1290^2 + 707^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163949 - 2²¹ = 66797 is a prime.

It is a super-3 number, since 3×2163949³ = 30399211433392678047, which contains 333 as substring.

2163949 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2163919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081974 + 1081975.

It is an arithmetic number, because the mean of its divisors is an integer number (1081975).

2^2163949 is an apocalyptic number.

It is an amenable number.

2163949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2163949 is an equidigital number, since it uses as much as digits as its factorization.

2163949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 2163949 is about 1471.0367092632. The cubic root of 2163949 is about 129.3448099486.

The spelling of 2163949 in words is "two million, one hundred sixty-three thousand, nine hundred forty-nine".