31628550821 has 12 divisors (see below), whose sum is σ = 36954489888. Its totient is φ = 26990748792.

The previous prime is 31628550817. The next prime is 31628550851. The reversal of 31628550821 is 12805582613.

It is not a de Polignac number, because 31628550821 - 2² = 31628550817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31628550851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1410641 + ... + 1432886.

It is an arithmetic number, because the mean of its divisors is an integer number (3079540824).

Almost surely, 2^31628550821 is an apocalyptic number.

It is an amenable number.

31628550821 is a deficient number, since it is larger than the sum of its proper divisors (5325939067).

31628550821 is a wasteful number, since it uses less digits than its factorization.

31628550821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843768 (or 2843761 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 31628550821 in words is "thirty-one billion, six hundred twenty-eight million, five hundred fifty thousand, eight hundred twenty-one".