31331243125 has 60 divisors (see below), whose sum is σ = 49047584124. Its totient is φ = 19831392000.

The previous prime is 31331243113. The next prime is 31331243173. The reversal of 31331243125 is 52134213313.

It can be written as a sum of positive squares in 10 ways, for example, as 31329708004 + 1535121 = 177002^2 + 1239^2 .

It is not a de Polignac number, because 31331243125 - 2⁷ = 31331242997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31331243093 and 31331243102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 358777 + ... + 437473.

Almost surely, 2^31331243125 is an apocalyptic number.

31331243125 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31331243125 is a deficient number, since it is larger than the sum of its proper divisors (17716340999).

31331243125 is an equidigital number, since it uses as much as digits as its factorization.

31331243125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78744 (or 78722 counting only the distinct ones).

The product of its digits is 6480, while the sum is 28.

Adding to 31331243125 its reverse (52134213313), we get a palindrome (83465456438).

The spelling of 31331243125 in words is "thirty-one billion, three hundred thirty-one million, two hundred forty-three thousand, one hundred twenty-five".