31427047 has 4 divisors (see below), whose sum is σ = 31464576. Its totient is φ = 31389520.

The previous prime is 31427027. The next prime is 31427089. The reversal of 31427047 is 74072413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31427047 - 2⁷ = 31426919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31427027) 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 in 3 ways as a sum of consecutive naturals, for example, 17479 + ... + 19192.

It is an arithmetic number, because the mean of its divisors is an integer number (7866144).

Almost surely, 2^31427047 is an apocalyptic number.

31427047 is a deficient number, since it is larger than the sum of its proper divisors (37529).

31427047 is an equidigital number, since it uses as much as digits as its factorization.

31427047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37528.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 31427047 is about 5605.9831430357. The cubic root of 31427047 is about 315.5739832845.

The spelling of 31427047 in words is "thirty-one million, four hundred twenty-seven thousand, forty-seven".