2179989923 has 2 divisors, whose sum is σ = 2179989924. Its totient is φ = 2179989922.

The previous prime is 2179989913. The next prime is 2179989949. The reversal of 2179989923 is 3299899712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2179989923 - 2²⁸ = 1911554467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2179989913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089994961 + 1089994962.

It is an arithmetic number, because the mean of its divisors is an integer number (1089994962).

Almost surely, 2^2179989923 is an apocalyptic number.

2179989923 is a deficient number, since it is larger than the sum of its proper divisors (1).

2179989923 is an equidigital number, since it uses as much as digits as its factorization.

2179989923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 59.

The square root of 2179989923 is about 46690.3622067767. The cubic root of 2179989923 is about 1296.6362590776.

The spelling of 2179989923 in words is "two billion, one hundred seventy-nine million, nine hundred eighty-nine thousand, nine hundred twenty-three".