31513043142 has 128 divisors (see below), whose sum is σ = 84676838400. Its totient is φ = 8486166528.

The previous prime is 31513043117. The next prime is 31513043147. The reversal of 31513043142 is 24134031513.

It is a happy number.

31513043142 is a `hidden beast` number, since 3 + 1 + 513 + 0 + 4 + 3 + 142 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31513043147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1403718 + ... + 1425990.

It is an arithmetic number, because the mean of its divisors is an integer number (661537800).

Almost surely, 2^31513043142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31513043142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42338419200).

31513043142 is an abundant number, since it is smaller than the sum of its proper divisors (53163795258).

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

31513043142 is a wasteful number, since it uses less digits than its factorization.

31513043142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22507 (or 22501 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 31513043142 its reverse (24134031513), we get a palindrome (55647074655).

The spelling of 31513043142 in words is "thirty-one billion, five hundred thirteen million, forty-three thousand, one hundred forty-two".