31312317 has 8 divisors (see below), whose sum is σ = 44205696. Its totient is φ = 19646912.

The previous prime is 31312301. The next prime is 31312327. The reversal of 31312317 is 71321313.

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 31312317 - 2⁴ = 31312301 is a prime.

It is a super-2 number, since 2×31312317² = 1960922391816978, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31312293 and 31312302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312327) 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 7 ways as a sum of consecutive naturals, for example, 306933 + ... + 307034.

It is an arithmetic number, because the mean of its divisors is an integer number (5525712).

Almost surely, 2^31312317 is an apocalyptic number.

It is an amenable number.

31312317 is a deficient number, since it is larger than the sum of its proper divisors (12893379).

31312317 is a wasteful number, since it uses less digits than its factorization.

31312317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613987.

The product of its digits is 378, while the sum is 21.

The square root of 31312317 is about 5595.7409697019. The cubic root of 31312317 is about 315.1894954552.

It can be divided in two parts, 3131 and 2317, that multiplied together give a palindrome (7254527).

The spelling of 31312317 in words is "thirty-one million, three hundred twelve thousand, three hundred seventeen".