31345243 has 4 divisors (see below), whose sum is σ = 31358880. Its totient is φ = 31331608.

The previous prime is 31345241. The next prime is 31345271. The reversal of 31345243 is 34254313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34254313 = 127 ⋅269719.

It is a cyclic number.

It is not a de Polignac number, because 31345243 - 2¹ = 31345241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31345241) 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, 2428 + ... + 8281.

It is an arithmetic number, because the mean of its divisors is an integer number (7839720).

Almost surely, 2^31345243 is an apocalyptic number.

31345243 is a deficient number, since it is larger than the sum of its proper divisors (13637).

31345243 is a wasteful number, since it uses less digits than its factorization.

31345243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13636.

The product of its digits is 4320, while the sum is 25.

The square root of 31345243 is about 5598.6822556741. The cubic root of 31345243 is about 315.2999343587.

Adding to 31345243 its reverse (34254313), we get a palindrome (65599556).

The spelling of 31345243 in words is "thirty-one million, three hundred forty-five thousand, two hundred forty-three".