31576542538 has 4 divisors (see below), whose sum is σ = 47364813810. Its totient is φ = 15788271268.

The previous prime is 31576542533. The next prime is 31576542581. The reversal of 31576542538 is 83524567513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83524567513 = 1637 ⋅51022949.

It can be written as a sum of positive squares in only one way, i.e., 24480670369 + 7095872169 = 156463^2 + 84237^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31576542491 and 31576542500.

It is not an unprimeable number, because it can be changed into a prime (31576542533) 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 as a sum of consecutive naturals, namely, 7894135633 + ... + 7894135636.

Almost surely, 2^31576542538 is an apocalyptic number.

31576542538 is a deficient number, since it is larger than the sum of its proper divisors (15788271272).

31576542538 is a wasteful number, since it uses less digits than its factorization.

31576542538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15788271271.

The product of its digits is 3024000, while the sum is 49.

The spelling of 31576542538 in words is "thirty-one billion, five hundred seventy-six million, five hundred forty-two thousand, five hundred thirty-eight".