31985713 has 4 divisors (see below), whose sum is σ = 32436288. Its totient is φ = 31535140.

The previous prime is 31985693. The next prime is 31985717. The reversal of 31985713 is 31758913.

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 31985713 - 2⁹ = 31985201 is a prime.

It is a super-2 number, since 2×31985713² = 2046171672236738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31985717) 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, 225181 + ... + 225322.

It is an arithmetic number, because the mean of its divisors is an integer number (8109072).

Almost surely, 2^31985713 is an apocalyptic number.

It is an amenable number.

31985713 is a deficient number, since it is larger than the sum of its proper divisors (450575).

31985713 is an equidigital number, since it uses as much as digits as its factorization.

31985713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450574.

The product of its digits is 22680, while the sum is 37.

The square root of 31985713 is about 5655.5913041874. The cubic root of 31985713 is about 317.4329550294.

It can be divided in two parts, 3198 and 5713, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 31985713 in words is "thirty-one million, nine hundred eighty-five thousand, seven hundred thirteen".