31505142042 has 48 divisors (see below), whose sum is σ = 74778387840. Its totient is φ = 9507052800.

The previous prime is 31505142007. The next prime is 31505142113. The reversal of 31505142042 is 24024150513.

31505142042 is a `hidden beast` number, since 3 + 150 + 51 + 420 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31505141997 and 31505142015.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285559 + ... + 380202.

It is an arithmetic number, because the mean of its divisors is an integer number (1557883080).

Almost surely, 2^31505142042 is an apocalyptic number.

31505142042 is an abundant number, since it is smaller than the sum of its proper divisors (43273245798).

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

31505142042 is a wasteful number, since it uses less digits than its factorization.

31505142042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666019 (or 666016 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 31505142042 its reverse (24024150513), we get a palindrome (55529292555).

The spelling of 31505142042 in words is "thirty-one billion, five hundred five million, one hundred forty-two thousand, forty-two".