31307268217 has 8 divisors (see below), whose sum is σ = 32389950600. Its totient is φ = 30224793984.

The previous prime is 31307268203. The next prime is 31307268227. The reversal of 31307268217 is 71286270313.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17034426256 + 14272841961 = 130516^2 + 119469^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31307268217 - 2¹⁹ = 31306743929 is a prime.

It is a super-2 number, since 2×31307268217² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31307268217.

It is not an unprimeable number, because it can be changed into a prime (31307268227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292803 + ... + 385159.

It is an arithmetic number, because the mean of its divisors is an integer number (4048743825).

Almost surely, 2^31307268217 is an apocalyptic number.

It is an amenable number.

31307268217 is a deficient number, since it is larger than the sum of its proper divisors (1082682383).

31307268217 is a wasteful number, since it uses less digits than its factorization.

31307268217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104075.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 31307268217 in words is "thirty-one billion, three hundred seven million, two hundred sixty-eight thousand, two hundred seventeen".