2189695949 has 4 divisors (see below), whose sum is σ = 2502509664. Its totient is φ = 1876882236.

The previous prime is 2189695913. The next prime is 2189695973. The reversal of 2189695949 is 9495969812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2189695949 - 2²⁸ = 1921260493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2189695891 and 2189695900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189695349) 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 in 3 ways as a sum of consecutive naturals, for example, 156406847 + ... + 156406860.

It is an arithmetic number, because the mean of its divisors is an integer number (625627416).

Almost surely, 2^2189695949 is an apocalyptic number.

It is an amenable number.

2189695949 is a deficient number, since it is larger than the sum of its proper divisors (312813715).

2189695949 is an equidigital number, since it uses as much as digits as its factorization.

2189695949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312813714.

The product of its digits is 12597120, while the sum is 62.

The square root of 2189695949 is about 46794.1871283176. The cubic root of 2189695949 is about 1298.5577593241.

The spelling of 2189695949 in words is "two billion, one hundred eighty-nine million, six hundred ninety-five thousand, nine hundred forty-nine".