31705313 has 4 divisors (see below), whose sum is σ = 31727808. Its totient is φ = 31682820.

The previous prime is 31705309. The next prime is 31705327. The reversal of 31705313 is 31350713.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31705313 - 2² = 31705309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31705363) 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 3 ways as a sum of consecutive naturals, for example, 8981 + ... + 12002.

It is an arithmetic number, because the mean of its divisors is an integer number (7931952).

Almost surely, 2^31705313 is an apocalyptic number.

It is an amenable number.

31705313 is a deficient number, since it is larger than the sum of its proper divisors (22495).

31705313 is a wasteful number, since it uses less digits than its factorization.

31705313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22494.

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

The square root of 31705313 is about 5630.7471085106. The cubic root of 31705313 is about 316.5026483327.

The spelling of 31705313 in words is "thirty-one million, seven hundred five thousand, three hundred thirteen".