31515323142 has 64 divisors (see below), whose sum is σ = 66800448000. Its totient is φ = 9884540160.

The previous prime is 31515323107. The next prime is 31515323201. The reversal of 31515323142 is 24132351513.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 19441092 + ... + 19442712.

It is an arithmetic number, because the mean of its divisors is an integer number (1043757000).

Almost surely, 2^31515323142 is an apocalyptic number.

31515323142 is an abundant number, since it is smaller than the sum of its proper divisors (35285124858).

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

31515323142 is a wasteful number, since it uses less digits than its factorization.

31515323142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2701.

The product of its digits is 10800, while the sum is 30.

Adding to 31515323142 its reverse (24132351513), we get a palindrome (55647674655).

The spelling of 31515323142 in words is "thirty-one billion, five hundred fifteen million, three hundred twenty-three thousand, one hundred forty-two".