3131881329 has 4 divisors (see below), whose sum is σ = 4175841776. Its totient is φ = 2087920884.

The previous prime is 3131881327. The next prime is 3131881339. The reversal of 3131881329 is 9231881313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3131881329 - 2¹ = 3131881327 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3131881327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521980219 + ... + 521980224.

It is an arithmetic number, because the mean of its divisors is an integer number (1043960444).

Almost surely, 2^3131881329 is an apocalyptic number.

It is an amenable number.

3131881329 is a deficient number, since it is larger than the sum of its proper divisors (1043960447).

3131881329 is a wasteful number, since it uses less digits than its factorization.

3131881329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043960446.

The product of its digits is 31104, while the sum is 39.

The square root of 3131881329 is about 55963.2140696011. The cubic root of 3131881329 is about 1463.0812092143.

The spelling of 3131881329 in words is "three billion, one hundred thirty-one million, eight hundred eighty-one thousand, three hundred twenty-nine".