31316813256769 has 4 divisors (see below), whose sum is σ = 31316835414996. Its totient is φ = 31316791098544.

The previous prime is 31316813256761. The next prime is 31316813256793. The reversal of 31316813256769 is 96765231861313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24495768462400 + 6821044794369 = 4949320^2 + 2611713^2 .

It is a cyclic number.

It is not a de Polignac number, because 31316813256769 - 2³ = 31316813256761 is a prime.

It is a super-2 number, since 2×31316813256769² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31316813256761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8803294 + ... + 11837719.

It is an arithmetic number, because the mean of its divisors is an integer number (7829208853749).

Almost surely, 2^{31316813256769} is an apocalyptic number.

It is an amenable number.

31316813256769 is a deficient number, since it is larger than the sum of its proper divisors (22158227).

31316813256769 is a wasteful number, since it uses less digits than its factorization.

31316813256769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22158226.

The product of its digits is 29393280, while the sum is 61.

The spelling of 31316813256769 in words is "thirty-one trillion, three hundred sixteen billion, eight hundred thirteen million, two hundred fifty-six thousand, seven hundred sixty-nine".