61313231317 has 4 divisors (see below), whose sum is σ = 66029633740. Its totient is φ = 56596828896.

The previous prime is 61313231311. The next prime is 61313231351. The reversal of 61313231317 is 71313231316.

It is a happy number.

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 15386169681 + 45927061636 = 124041^2 + 214306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61313231317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61313231311) 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 3 ways as a sum of consecutive naturals, for example, 2358201192 + ... + 2358201217.

It is an arithmetic number, because the mean of its divisors is an integer number (16507408435).

Almost surely, 2^61313231317 is an apocalyptic number.

It is an amenable number.

61313231317 is a deficient number, since it is larger than the sum of its proper divisors (4716402423).

61313231317 is a wasteful number, since it uses less digits than its factorization.

61313231317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716402422.

The product of its digits is 6804, while the sum is 31.

Subtracting 61313231317 from its reverse (71313231316), we obtain a palindrome (9999999999).

The spelling of 61313231317 in words is "sixty-one billion, three hundred thirteen million, two hundred thirty-one thousand, three hundred seventeen".