31297 has 8 divisors (see below), whose sum is σ = 38016. Its totient is φ = 25152.

The previous prime is 31277. The next prime is 31307. The reversal of 31297 is 79213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31297 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 (31237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13 + ... + 250.

It is an arithmetic number, because the mean of its divisors is an integer number (4752).

2³¹²⁹⁷ is an apocalyptic number.

It is an amenable number.

31297 is a deficient number, since it is larger than the sum of its proper divisors (6719).

31297 is a wasteful number, since it uses less digits than its factorization.

31297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its digits is 378, while the sum is 22.

The square root of 31297 is about 176.9095814251. The cubic root of 31297 is about 31.5138093479.

It can be divided in two parts, 3129 and 7, that added together give a square (3136 = 56²).

The spelling of 31297 in words is "thirty-one thousand, two hundred ninety-seven".