31143143121 has 4 divisors (see below), whose sum is σ = 41524190832. Its totient is φ = 20762095412.

The previous prime is 31143143041. The next prime is 31143143147. The reversal of 31143143121 is 12134134113.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12134134113 = 3 ⋅4044711371.

It is a cyclic number.

It is not a de Polignac number, because 31143143121 - 2⁷ = 31143142993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31143143091 and 31143143100.

It is not an unprimeable number, because it can be changed into a prime (31143143221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5190523851 + ... + 5190523856.

It is an arithmetic number, because the mean of its divisors is an integer number (10381047708).

Almost surely, 2^31143143121 is an apocalyptic number.

It is an amenable number.

31143143121 is a deficient number, since it is larger than the sum of its proper divisors (10381047711).

31143143121 is a wasteful number, since it uses less digits than its factorization.

31143143121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10381047710.

The product of its digits is 864, while the sum is 24.

Adding to 31143143121 its reverse (12134134113), we get a palindrome (43277277234).

The spelling of 31143143121 in words is "thirty-one billion, one hundred forty-three million, one hundred forty-three thousand, one hundred twenty-one".