31117967473 has 4 divisors (see below), whose sum is σ = 31122865828. Its totient is φ = 31113069120.

The previous prime is 31117967449. The next prime is 31117967501. The reversal of 31117967473 is 37476971113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37476971113 = 809 ⋅46325057.

It can be written as a sum of positive squares in 2 ways, for example, as 15058234944 + 16059732529 = 122712^2 + 126727^2 .

It is a cyclic number.

It is not a de Polignac number, because 31117967473 - 2⁹ = 31117966961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31117967273) 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 3 ways as a sum of consecutive naturals, for example, 2439636 + ... + 2452357.

It is an arithmetic number, because the mean of its divisors is an integer number (7780716457).

Almost surely, 2^31117967473 is an apocalyptic number.

It is an amenable number.

31117967473 is a deficient number, since it is larger than the sum of its proper divisors (4898355).

31117967473 is an equidigital number, since it uses as much as digits as its factorization.

31117967473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4898354.

The product of its digits is 666792, while the sum is 49.

The spelling of 31117967473 in words is "thirty-one billion, one hundred seventeen million, nine hundred sixty-seven thousand, four hundred seventy-three".