31340257 has 8 divisors (see below), whose sum is σ = 33999336. Its totient is φ = 28716672.

The previous prime is 31340233. The next prime is 31340273. The reversal of 31340257 is 75204313.

It can be written as a sum of positive squares in 4 ways, for example, as 159201 + 31181056 = 399^2 + 5584^2 .

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-31340257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31340207) 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, 7018 + ... + 10579.

It is an arithmetic number, because the mean of its divisors is an integer number (4249917).

Almost surely, 2^31340257 is an apocalyptic number.

It is an amenable number.

31340257 is a deficient number, since it is larger than the sum of its proper divisors (2659079).

31340257 is a wasteful number, since it uses less digits than its factorization.

31340257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17747.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 31340257 is about 5598.2369546135. The cubic root of 31340257 is about 315.2832155131.

The spelling of 31340257 in words is "thirty-one million, three hundred forty thousand, two hundred fifty-seven".