31203220113 has 32 divisors (see below), whose sum is σ = 50382756480. Its totient is φ = 18970614720.

The previous prime is 31203220093. The next prime is 31203220121. The reversal of 31203220113 is 31102230213.

It is not a de Polignac number, because 31203220113 - 2⁶ = 31203220049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31203227113) 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 31 ways as a sum of consecutive naturals, for example, 506398 + ... + 564663.

It is an arithmetic number, because the mean of its divisors is an integer number (1574461140).

Almost surely, 2^31203220113 is an apocalyptic number.

It is an amenable number.

31203220113 is a deficient number, since it is larger than the sum of its proper divisors (19179536367).

31203220113 is a wasteful number, since it uses less digits than its factorization.

31203220113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071166 (or 1071160 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31203220113 its reverse (31102230213), we get a palindrome (62305450326).

The spelling of 31203220113 in words is "thirty-one billion, two hundred three million, two hundred twenty thousand, one hundred thirteen".