31005215225 has 6 divisors (see below), whose sum is σ = 38446466910. Its totient is φ = 24804172160.

The previous prime is 31005215207. The next prime is 31005215273. The reversal of 31005215225 is 52251250013.

It can be written as a sum of positive squares in 3 ways, for example, as 414855424 + 30590359801 = 20368^2 + 174901^2 .

It is not a de Polignac number, because 31005215225 - 2¹⁴ = 31005198841 is a prime.

It is a super-2 number, since 2×31005215225² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31005215194 and 31005215203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 620104280 + ... + 620104329.

It is an arithmetic number, because the mean of its divisors is an integer number (6407744485).

Almost surely, 2^31005215225 is an apocalyptic number.

It is an amenable number.

31005215225 is a deficient number, since it is larger than the sum of its proper divisors (7441251685).

31005215225 is a wasteful number, since it uses less digits than its factorization.

31005215225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240208619 (or 1240208614 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 31005215225 its reverse (52251250013), we get a palindrome (83256465238).

The spelling of 31005215225 in words is "thirty-one billion, five million, two hundred fifteen thousand, two hundred twenty-five".