2987691871 has 4 divisors (see below), whose sum is σ = 2987844112. Its totient is φ = 2987539632.

The previous prime is 2987691869. The next prime is 2987691907. The reversal of 2987691871 is 1781967892.

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 2987691871 - 2¹ = 2987691869 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 (2987691071) 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, 41406 + ... + 87691.

It is an arithmetic number, because the mean of its divisors is an integer number (746961028).

Almost surely, 2^2987691871 is an apocalyptic number.

2987691871 is a deficient number, since it is larger than the sum of its proper divisors (152241).

2987691871 is a wasteful number, since it uses less digits than its factorization.

2987691871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152240.

The product of its digits is 3048192, while the sum is 58.

The square root of 2987691871 is about 54659.7829395617. The cubic root of 2987691871 is about 1440.2744896944.

The spelling of 2987691871 in words is "two billion, nine hundred eighty-seven million, six hundred ninety-one thousand, eight hundred seventy-one".