2011564897 has 4 divisors (see below), whose sum is σ = 2058345520. Its totient is φ = 1964784276.

The previous prime is 2011564883. The next prime is 2011564909. The reversal of 2011564897 is 7984651102.

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 2011564897 - 2⁷ = 2011564769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 46780579 = 2011564897 / (2 + 0 + 1 + 1 + 5 + 6 + 4 + 8 + 9 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011564847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23390247 + ... + 23390332.

It is an arithmetic number, because the mean of its divisors is an integer number (514586380).

Almost surely, 2^2011564897 is an apocalyptic number.

It is an amenable number.

2011564897 is a deficient number, since it is larger than the sum of its proper divisors (46780623).

2011564897 is an equidigital number, since it uses as much as digits as its factorization.

2011564897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46780622.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 2011564897 is about 44850.4726507982. The cubic root of 2011564897 is about 1262.3448602231.

The spelling of 2011564897 in words is "two billion, eleven million, five hundred sixty-four thousand, eight hundred ninety-seven".