31123313142 has 32 divisors (see below), whose sum is σ = 65915845632. Its totient is φ = 9763042944.

The previous prime is 31123313141. The next prime is 31123313153. The reversal of 31123313142 is 24131332113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123313141) 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 15 ways as a sum of consecutive naturals, for example, 1495903 + ... + 1516565.

It is an arithmetic number, because the mean of its divisors is an integer number (2059870176).

Almost surely, 2^31123313142 is an apocalyptic number.

31123313142 is an abundant number, since it is smaller than the sum of its proper divisors (34792532490).

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

31123313142 is a wasteful number, since it uses less digits than its factorization.

31123313142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35452.

The product of its digits is 1296, while the sum is 24.

Adding to 31123313142 its reverse (24131332113), we get a palindrome (55254645255).

The spelling of 31123313142 in words is "thirty-one billion, one hundred twenty-three million, three hundred thirteen thousand, one hundred forty-two".