31542135521 has 8 divisors (see below), whose sum is σ = 34171859904. Its totient is φ = 28941469200.

The previous prime is 31542135509. The next prime is 31542135523. The reversal of 31542135521 is 12553124513.

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

It is a cyclic number.

It is not a de Polignac number, because 31542135521 - 2¹⁰ = 31542134497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31542135523) 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, 7262255 + ... + 7266596.

It is an arithmetic number, because the mean of its divisors is an integer number (4271482488).

Almost surely, 2^31542135521 is an apocalyptic number.

It is an amenable number.

31542135521 is a deficient number, since it is larger than the sum of its proper divisors (2629724383).

31542135521 is a wasteful number, since it uses less digits than its factorization.

31542135521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14529031.

The product of its digits is 18000, while the sum is 32.

The spelling of 31542135521 in words is "thirty-one billion, five hundred forty-two million, one hundred thirty-five thousand, five hundred twenty-one".