31713305 has 8 divisors (see below), whose sum is σ = 40983432. Its totient is φ = 23419008.

The previous prime is 31713259. The next prime is 31713307. The reversal of 31713305 is 50331713.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5621641 + 26091664 = 2371^2 + 5108^2 .

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 31713305 - 2²² = 27519001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31713307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243884 + ... + 244013.

It is an arithmetic number, because the mean of its divisors is an integer number (5122929).

Almost surely, 2^31713305 is an apocalyptic number.

It is an amenable number.

31713305 is a deficient number, since it is larger than the sum of its proper divisors (9270127).

31713305 is a wasteful number, since it uses less digits than its factorization.

31713305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487915.

The product of its (nonzero) digits is 945, while the sum is 23.

The square root of 31713305 is about 5631.4567387134. The cubic root of 31713305 is about 316.5292398450.

The spelling of 31713305 in words is "thirty-one million, seven hundred thirteen thousand, three hundred five".