31987746433 has 8 divisors (see below), whose sum is σ = 32149877120. Its totient is φ = 31825951920.

The previous prime is 31987746389. The next prime is 31987746437. The reversal of 31987746433 is 33464778913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31987746433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31987746437) 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 7 ways as a sum of consecutive naturals, for example, 107848 + ... + 274966.

It is an arithmetic number, because the mean of its divisors is an integer number (4018734640).

Almost surely, 2^31987746433 is an apocalyptic number.

It is an amenable number.

31987746433 is a deficient number, since it is larger than the sum of its proper divisors (162130687).

31987746433 is a wasteful number, since it uses less digits than its factorization.

31987746433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168087.

The product of its digits is 9144576, while the sum is 55.

The spelling of 31987746433 in words is "thirty-one billion, nine hundred eighty-seven million, seven hundred forty-six thousand, four hundred thirty-three".