31143013420 has 24 divisors (see below), whose sum is σ = 65710291248. Its totient is φ = 12398164800.

The previous prime is 31143013393. The next prime is 31143013423. The reversal of 31143013420 is 2431034113.

It is a junction number, because it is equal to n+sod(n) for n = 31143013391 and 31143013400.

It is not an unprimeable number, because it can be changed into a prime (31143013423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3685711 + ... + 3694150.

It is an arithmetic number, because the mean of its divisors is an integer number (2737928802).

Almost surely, 2^31143013420 is an apocalyptic number.

It is an amenable number.

31143013420 is an abundant number, since it is smaller than the sum of its proper divisors (34567277828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31143013420 is a wasteful number, since it uses less digits than its factorization.

31143013420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380081 (or 7380079 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31143013420 its reverse (2431034113), we get a palindrome (33574047533).

The spelling of 31143013420 in words is "thirty-one billion, one hundred forty-three million, thirteen thousand, four hundred twenty".