31320217052 has 12 divisors (see below), whose sum is σ = 54814590096. Its totient is φ = 15658905600.

The previous prime is 31320217021. The next prime is 31320217081. The reversal of 31320217052 is 25071202313.

It is a super-3 number, since 3×31320217052³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 240824 + ... + 347327.

It is an arithmetic number, because the mean of its divisors is an integer number (4567882508).

Almost surely, 2^31320217052 is an apocalyptic number.

It is an amenable number.

31320217052 is a deficient number, since it is larger than the sum of its proper divisors (23494373044).

31320217052 is a wasteful number, since it uses less digits than its factorization.

31320217052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601468 (or 601466 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

Adding to 31320217052 its reverse (25071202313), we get a palindrome (56391419365).

The spelling of 31320217052 in words is "thirty-one billion, three hundred twenty million, two hundred seventeen thousand, fifty-two".