31528069042 has 4 divisors (see below), whose sum is σ = 47292103566. Its totient is φ = 15764034520.

The previous prime is 31528069021. The next prime is 31528069091. The reversal of 31528069042 is 24096082513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17609024601 + 13919044441 = 132699^2 + 117979^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 31528068986 and 31528069004.

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 as a sum of consecutive naturals, namely, 7882017259 + ... + 7882017262.

Almost surely, 2^31528069042 is an apocalyptic number.

31528069042 is a deficient number, since it is larger than the sum of its proper divisors (15764034524).

31528069042 is a wasteful number, since it uses less digits than its factorization.

31528069042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15764034523.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 31528069042 in words is "thirty-one billion, five hundred twenty-eight million, sixty-nine thousand, forty-two".