31205144012 has 24 divisors (see below), whose sum is σ = 62733668256. Its totient is φ = 13304337408.

The previous prime is 31205144011. The next prime is 31205144023. The reversal of 31205144012 is 21044150213.

It is a super-2 number, since 2×31205144012² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31205144011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2881823 + ... + 2892630.

It is an arithmetic number, because the mean of its divisors is an integer number (2613902844).

Almost surely, 2^31205144012 is an apocalyptic number.

It is an amenable number.

31205144012 is an abundant number, since it is smaller than the sum of its proper divisors (31528524244).

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

31205144012 is a wasteful number, since it uses less digits than its factorization.

31205144012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5774657 (or 5774655 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 31205144012 its reverse (21044150213), we get a palindrome (52249294225).

The spelling of 31205144012 in words is "thirty-one billion, two hundred five million, one hundred forty-four thousand, twelve".