2031220917 has 24 divisors (see below), whose sum is σ = 3207204000. Its totient is φ = 1228546080.

The previous prime is 2031220913. The next prime is 2031220943. The reversal of 2031220917 is 7190221302.

It is not a de Polignac number, because 2031220917 - 2² = 2031220913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031220913) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 28843 + ... + 69959.

It is an arithmetic number, because the mean of its divisors is an integer number (133633500).

Almost surely, 2^2031220917 is an apocalyptic number.

It is an amenable number.

2031220917 is a deficient number, since it is larger than the sum of its proper divisors (1175983083).

2031220917 is a wasteful number, since it uses less digits than its factorization.

2031220917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41633 (or 41630 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 2031220917 is about 45069.0682952288. The cubic root of 2031220917 is about 1266.4432104972.

The spelling of 2031220917 in words is "two billion, thirty-one million, two hundred twenty thousand, nine hundred seventeen".