2891391964 has 6 divisors (see below), whose sum is σ = 5059935944. Its totient is φ = 1445695980.

The previous prime is 2891391947. The next prime is 2891391967. The reversal of 2891391964 is 4691931982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891391967) 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 as a sum of consecutive naturals, namely, 361423992 + ... + 361423999.

Almost surely, 2^2891391964 is an apocalyptic number.

It is an amenable number.

2891391964 is a deficient number, since it is larger than the sum of its proper divisors (2168543980).

2891391964 is a wasteful number, since it uses less digits than its factorization.

2891391964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722847995 (or 722847993 counting only the distinct ones).

The product of its digits is 839808, while the sum is 52.

The square root of 2891391964 is about 53771.6650662782. The cubic root of 2891391964 is about 1424.6307797299.

The spelling of 2891391964 in words is "two billion, eight hundred ninety-one million, three hundred ninety-one thousand, nine hundred sixty-four".