2891391802643 has 4 divisors (see below), whose sum is σ = 2891397835560. Its totient is φ = 2891385769728.

The previous prime is 2891391802639. The next prime is 2891391802667. The reversal of 2891391802643 is 3462081931982.

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 2891391802643 - 2² = 2891391802639 is a prime.

It is a super-2 number, since 2×2891391802643² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2891391802843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2229038 + ... + 3278931.

It is an arithmetic number, because the mean of its divisors is an integer number (722849458890).

Almost surely, 2^{2891391802643} is an apocalyptic number.

2891391802643 is a deficient number, since it is larger than the sum of its proper divisors (6032917).

2891391802643 is an equidigital number, since it uses as much as digits as its factorization.

2891391802643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6032916.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 2891391802643 in words is "two trillion, eight hundred ninety-one billion, three hundred ninety-one million, eight hundred two thousand, six hundred forty-three".