2091642973 has 4 divisors (see below), whose sum is σ = 2390449120. Its totient is φ = 1792836828.

The previous prime is 2091642907. The next prime is 2091643027. The reversal of 2091642973 is 3792461902.

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 2091642973 - 2⁹ = 2091642461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091643973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149403063 + ... + 149403076.

It is an arithmetic number, because the mean of its divisors is an integer number (597612280).

Almost surely, 2^2091642973 is an apocalyptic number.

It is an amenable number.

2091642973 is a deficient number, since it is larger than the sum of its proper divisors (298806147).

2091642973 is an equidigital number, since it uses as much as digits as its factorization.

2091642973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298806146.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 2091642973 is about 45734.4834124099. The cubic root of 2091642973 is about 1278.8782027270.

The spelling of 2091642973 in words is "two billion, ninety-one million, six hundred forty-two thousand, nine hundred seventy-three".