31340213 has 8 divisors (see below), whose sum is σ = 32643000. Its totient is φ = 30052288.

The previous prime is 31340209. The next prime is 31340227. The reversal of 31340213 is 31204313.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2845969 + 28494244 = 1687^2 + 5338^2 .

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 31340213 - 2² = 31340209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31340191 and 31340200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31340203) 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, 695 + ... + 7947.

It is an arithmetic number, because the mean of its divisors is an integer number (4080375).

Almost surely, 2^31340213 is an apocalyptic number.

It is an amenable number.

31340213 is a deficient number, since it is larger than the sum of its proper divisors (1302787).

31340213 is a wasteful number, since it uses less digits than its factorization.

31340213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7431.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31340213 is about 5598.2330248035. The cubic root of 31340213 is about 315.2830679663.

Adding to 31340213 its reverse (31204313), we get a palindrome (62544526).

The spelling of 31340213 in words is "thirty-one million, three hundred forty thousand, two hundred thirteen".