31921987601 has 8 divisors (see below), whose sum is σ = 36483435840. Its totient is φ = 27360830448.

The previous prime is 31921987567. The next prime is 31921987607. The reversal of 31921987601 is 10678912913.

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

It is a de Polignac number, because none of the positive numbers 2^k-31921987601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31921987607) 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, 269675 + ... + 369551.

It is an arithmetic number, because the mean of its divisors is an integer number (4560429480).

Almost surely, 2^31921987601 is an apocalyptic number.

It is an amenable number.

31921987601 is a deficient number, since it is larger than the sum of its proper divisors (4561448239).

31921987601 is an equidigital number, since it uses as much as digits as its factorization.

31921987601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145543.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 31921987601 in words is "thirty-one billion, nine hundred twenty-one million, nine hundred eighty-seven thousand, six hundred one".