3991131002 has 8 divisors (see below), whose sum is σ = 5987536212. Its totient is φ = 1995285600.

The previous prime is 3991130999. The next prime is 3991131031. The reversal of 3991131002 is 2001311993.

It can be written as a sum of positive squares in 2 ways, for example, as 3607323721 + 383807281 = 60061^2 + 19591^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121649 + ... + 150932.

Almost surely, 2^3991131002 is an apocalyptic number.

3991131002 is a deficient number, since it is larger than the sum of its proper divisors (1996405210).

3991131002 is a wasteful number, since it uses less digits than its factorization.

3991131002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279904.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 3991131002 is about 63175.3987086746. The cubic root of 3991131002 is about 1586.2269623941.

Adding to 3991131002 its reverse (2001311993), we get a palindrome (5992442995).

The spelling of 3991131002 in words is "three billion, nine hundred ninety-one million, one hundred thirty-one thousand, two".