31845217512 has 32 divisors (see below), whose sum is σ = 79943402880. Its totient is φ = 10571024640.

The previous prime is 31845217499. The next prime is 31845217559. The reversal of 31845217512 is 21571254813.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2747088 + ... + 2758655.

It is an arithmetic number, because the mean of its divisors is an integer number (2498231340).

Almost surely, 2^31845217512 is an apocalyptic number.

It is an amenable number.

31845217512 is an abundant number, since it is smaller than the sum of its proper divisors (48098185368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31845217512 is a wasteful number, since it uses less digits than its factorization.

31845217512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5505993 (or 5505989 counting only the distinct ones).

The product of its digits is 67200, while the sum is 39.

The spelling of 31845217512 in words is "thirty-one billion, eight hundred forty-five million, two hundred seventeen thousand, five hundred twelve".