31021303986 has 48 divisors (see below), whose sum is σ = 68092776960. Its totient is φ = 10205170560.

The previous prime is 31021303961. The next prime is 31021303997. The reversal of 31021303986 is 68930312013.

It is a self number, because there is not a number n which added to its sum of digits gives 31021303986.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6483351 + ... + 6488133.

It is an arithmetic number, because the mean of its divisors is an integer number (1418599520).

Almost surely, 2^31021303986 is an apocalyptic number.

31021303986 is an abundant number, since it is smaller than the sum of its proper divisors (37071472974).

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

31021303986 is a wasteful number, since it uses less digits than its factorization.

31021303986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9431 (or 9428 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

Adding to 31021303986 its reverse (68930312013), we get a palindrome (99951615999).

The spelling of 31021303986 in words is "thirty-one billion, twenty-one million, three hundred three thousand, nine hundred eighty-six".