3131143421 has 4 divisors (see below), whose sum is σ = 3578449632. Its totient is φ = 2683837212.

The previous prime is 3131143409. The next prime is 3131143439. The reversal of 3131143421 is 1243411313.

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 a de Polignac number, because none of the positive numbers 2^k-3131143421 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 (3131143451) 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, 223653095 + ... + 223653108.

It is an arithmetic number, because the mean of its divisors is an integer number (894612408).

Almost surely, 2^3131143421 is an apocalyptic number.

It is an amenable number.

3131143421 is a deficient number, since it is larger than the sum of its proper divisors (447306211).

3131143421 is an equidigital number, since it uses as much as digits as its factorization.

3131143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447306210.

The product of its digits is 864, while the sum is 23.

The square root of 3131143421 is about 55956.6208861829. The cubic root of 3131143421 is about 1462.9662938203.

Adding to 3131143421 its reverse (1243411313), we get a palindrome (4374554734).

The spelling of 3131143421 in words is "three billion, one hundred thirty-one million, one hundred forty-three thousand, four hundred twenty-one".