2987121831 has 8 divisors (see below), whose sum is σ = 3994648944. Its totient is φ = 1985504640.

The previous prime is 2987121791. The next prime is 2987121847. The reversal of 2987121831 is 1381217892.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2987121831 - 2¹⁴ = 2987105447 is a prime.

It is a super-2 number, since 2×2987121831² = 17845793666473585122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2987121881) 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 7 ways as a sum of consecutive naturals, for example, 1476300 + ... + 1478321.

It is an arithmetic number, because the mean of its divisors is an integer number (499331118).

Almost surely, 2^2987121831 is an apocalyptic number.

2987121831 is a deficient number, since it is larger than the sum of its proper divisors (1007527113).

2987121831 is a wasteful number, since it uses less digits than its factorization.

2987121831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954961.

The product of its digits is 48384, while the sum is 42.

The square root of 2987121831 is about 54654.5682537151. The cubic root of 2987121831 is about 1440.1828842760.

The spelling of 2987121831 in words is "two billion, nine hundred eighty-seven million, one hundred twenty-one thousand, eight hundred thirty-one".