31442347 has 2 divisors, whose sum is σ = 31442348. Its totient is φ = 31442346.

The previous prime is 31442273. The next prime is 31442353. The reversal of 31442347 is 74324413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31442347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31442377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15721173 + 15721174.

It is an arithmetic number, because the mean of its divisors is an integer number (15721174).

Almost surely, 2^31442347 is an apocalyptic number.

31442347 is a deficient number, since it is larger than the sum of its proper divisors (1).

31442347 is an equidigital number, since it uses as much as digits as its factorization.

31442347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 28.

The square root of 31442347 is about 5607.3475904388. The cubic root of 31442347 is about 315.6251865110.

The spelling of 31442347 in words is "thirty-one million, four hundred forty-two thousand, three hundred forty-seven".