2179989949 has 2 divisors, whose sum is σ = 2179989950. Its totient is φ = 2179989948.

The previous prime is 2179989923. The next prime is 2179989971. The reversal of 2179989949 is 9499899712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188180900 + 991809049 = 34470^2 + 31493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2179989949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2179989989) 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, 1089994974 + 1089994975.

It is an arithmetic number, because the mean of its divisors is an integer number (1089994975).

Almost surely, 2^2179989949 is an apocalyptic number.

It is an amenable number.

2179989949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2179989949 is an equidigital number, since it uses as much as digits as its factorization.

2179989949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 67.

The square root of 2179989949 is about 46690.3624852067. The cubic root of 2179989949 is about 1296.6362642324.

The spelling of 2179989949 in words is "two billion, one hundred seventy-nine million, nine hundred eighty-nine thousand, nine hundred forty-nine".