2971945805509 has 4 divisors (see below), whose sum is σ = 2976033764704. Its totient is φ = 2967857846316.

The previous prime is 2971945805497. The next prime is 2971945805531. The reversal of 2971945805509 is 9055085491792.

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 2971945805509 - 2¹⁷ = 2971945674437 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 (2971945805579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043978507 + ... + 2043979960.

It is an arithmetic number, because the mean of its divisors is an integer number (744008441176).

Almost surely, 2^{2971945805509} is an apocalyptic number.

It is an amenable number.

2971945805509 is a deficient number, since it is larger than the sum of its proper divisors (4087959195).

2971945805509 is an equidigital number, since it uses as much as digits as its factorization.

2971945805509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4087959194.

The product of its (nonzero) digits is 40824000, while the sum is 64.

The spelling of 2971945805509 in words is "two trillion, nine hundred seventy-one billion, nine hundred forty-five million, eight hundred five thousand, five hundred nine".