31689241 has 8 divisors (see below), whose sum is σ = 33604200. Its totient is φ = 29779968.

The previous prime is 31689157. The next prime is 31689247. The reversal of 31689241 is 14298613.

It can be written as a sum of positive squares in 4 ways, for example, as 15721225 + 15968016 = 3965^2 + 3996^2 .

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 31689241 - 2⁷ = 31689113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31689197 and 31689206.

It is not an unprimeable number, because it can be changed into a prime (31689247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16945 + ... + 18721.

It is an arithmetic number, because the mean of its divisors is an integer number (4200525).

Almost surely, 2^31689241 is an apocalyptic number.

It is an amenable number.

31689241 is a deficient number, since it is larger than the sum of its proper divisors (1914959).

31689241 is a wasteful number, since it uses less digits than its factorization.

31689241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2843.

The product of its digits is 10368, while the sum is 34.

The square root of 31689241 is about 5629.3197635238. The cubic root of 31689241 is about 316.4491589765.

The spelling of 31689241 in words is "thirty-one million, six hundred eighty-nine thousand, two hundred forty-one".