31697 has 4 divisors (see below), whose sum is σ = 32820. Its totient is φ = 30576.
The previous prime is 31687. The next prime is 31699. The reversal of 31697 is 79613.
It is a happy number.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 25921 + 5776 = 161^2 + 76^2 .
It is a cyclic number.
It is not a de Polignac number, because 31697 - 214 = 15313 is a prime.
It is a Duffinian number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31697.
It is not an unprimeable number, because it can be changed into a prime (31699) 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, 518 + ... + 575.
It is an arithmetic number, because the mean of its divisors is an integer number (8205).
231697 is an apocalyptic number.
It is an amenable number.
31697 is a deficient number, since it is larger than the sum of its proper divisors (1123).
31697 is a wasteful number, since it uses less digits than its factorization.
31697 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1122.
The product of its digits is 1134, while the sum is 26.
The square root of 31697 is about 178.0365131090. The cubic root of 31697 is about 31.6474984026.
The spelling of 31697 in words is "thirty-one thousand, six hundred ninety-seven".
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