3129891231 has 4 divisors (see below), whose sum is σ = 4173188312. Its totient is φ = 2086594152.

The previous prime is 3129891197. The next prime is 3129891253. The reversal of 3129891231 is 1321989213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321989213 = 3 ⋅440663071.

It is not a de Polignac number, because 3129891231 - 2¹¹ = 3129889183 is a prime.

It is a super-2 number, since 2×3129891231² = 19592438235781390722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3129891231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3129891031) 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, 521648536 + ... + 521648541.

It is an arithmetic number, because the mean of its divisors is an integer number (1043297078).

Almost surely, 2^3129891231 is an apocalyptic number.

3129891231 is a deficient number, since it is larger than the sum of its proper divisors (1043297081).

3129891231 is a wasteful number, since it uses less digits than its factorization.

3129891231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043297080.

The product of its digits is 23328, while the sum is 39.

The square root of 3129891231 is about 55945.4308321958. The cubic root of 3129891231 is about 1462.7712472857.

The spelling of 3129891231 in words is "three billion, one hundred twenty-nine million, eight hundred ninety-one thousand, two hundred thirty-one".