31029330393 has 90 divisors (see below), whose sum is σ = 50646931038. Its totient is φ = 18866476800.

The previous prime is 31029330389. The next prime is 31029330403. The reversal of 31029330393 is 39303392013.

31029330393 is a `hidden beast` number, since 310 + 2 + 9 + 330 + 3 + 9 + 3 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 25296266304 + 5733064089 = 159048^2 + 75717^2 .

It is not a de Polignac number, because 31029330393 - 2² = 31029330389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31029330323) 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 89 ways as a sum of consecutive naturals, for example, 307221043 + ... + 307221143.

Almost surely, 2^31029330393 is an apocalyptic number.

It is an amenable number.

31029330393 is a deficient number, since it is larger than the sum of its proper divisors (19617600645).

31029330393 is an equidigital number, since it uses as much as digits as its factorization.

31029330393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 36.

The spelling of 31029330393 in words is "thirty-one billion, twenty-nine million, three hundred thirty thousand, three hundred ninety-three".