31445543561 has 8 divisors (see below), whose sum is σ = 31570434720. Its totient is φ = 31320850048.

The previous prime is 31445543543. The next prime is 31445543567. The reversal of 31445543561 is 16534554413.

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 31445543561 - 2⁶ = 31445543497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31445543567) 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, 273590 + ... + 371136.

It is an arithmetic number, because the mean of its divisors is an integer number (3946304340).

Almost surely, 2^31445543561 is an apocalyptic number.

It is an amenable number.

31445543561 is a deficient number, since it is larger than the sum of its proper divisors (124891159).

31445543561 is an equidigital number, since it uses as much as digits as its factorization.

31445543561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98823.

The product of its digits is 432000, while the sum is 41.

The spelling of 31445543561 in words is "thirty-one billion, four hundred forty-five million, five hundred forty-three thousand, five hundred sixty-one".