2931438643 has 4 divisors (see below), whose sum is σ = 3350215600. Its totient is φ = 2512661688.

The previous prime is 2931438641. The next prime is 2931438683. The reversal of 2931438643 is 3468341392.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2931438643 - 2¹ = 2931438641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2931438643.

It is not an unprimeable number, because it can be changed into a prime (2931438641) 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, 209388468 + ... + 209388481.

It is an arithmetic number, because the mean of its divisors is an integer number (837553900).

Almost surely, 2^2931438643 is an apocalyptic number.

2931438643 is a deficient number, since it is larger than the sum of its proper divisors (418776957).

2931438643 is an equidigital number, since it uses as much as digits as its factorization.

2931438643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418776956.

The product of its digits is 373248, while the sum is 43.

The square root of 2931438643 is about 54142.7616861201. The cubic root of 2931438643 is about 1431.1778391490.

The spelling of 2931438643 in words is "two billion, nine hundred thirty-one million, four hundred thirty-eight thousand, six hundred forty-three".