31540343 has 2 divisors, whose sum is σ = 31540344. Its totient is φ = 31540342.

The previous prime is 31540339. The next prime is 31540363. The reversal of 31540343 is 34304513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31540343 - 2² = 31540339 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31540363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770171 + 15770172.

It is an arithmetic number, because the mean of its divisors is an integer number (15770172).

Almost surely, 2^31540343 is an apocalyptic number.

31540343 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540343 is an equidigital number, since it uses as much as digits as its factorization.

31540343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 31540343 is about 5616.0789702425. The cubic root of 31540343 is about 315.9527482357.

Adding to 31540343 its reverse (34304513), we get a palindrome (65844856).

The spelling of 31540343 in words is "thirty-one million, five hundred forty thousand, three hundred forty-three".