31215442052 has 12 divisors (see below), whose sum is σ = 56103429900. Its totient is φ = 15185890656.

The previous prime is 31215441997. The next prime is 31215442091. The reversal of 31215442052 is 25024451213.

It can be written as a sum of positive squares in 2 ways, for example, as 27617121856 + 3598320196 = 166184^2 + 59986^2 .

It is a super-3 number, since 3×31215442052³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105457427 + ... + 105457722.

It is an arithmetic number, because the mean of its divisors is an integer number (4675285825).

Almost surely, 2^31215442052 is an apocalyptic number.

It is an amenable number.

31215442052 is a deficient number, since it is larger than the sum of its proper divisors (24887987848).

31215442052 is a wasteful number, since it uses less digits than its factorization.

31215442052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210915190 (or 210915188 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 31215442052 its reverse (25024451213), we get a palindrome (56239893265).

The spelling of 31215442052 in words is "thirty-one billion, two hundred fifteen million, four hundred forty-two thousand, fifty-two".