31423047 has 4 divisors (see below), whose sum is σ = 41897400. Its totient is φ = 20948696.

The previous prime is 31423039. The next prime is 31423081. The reversal of 31423047 is 74032413.

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 31423047 - 2³ = 31423039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423747) 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, 5237172 + ... + 5237177.

It is an arithmetic number, because the mean of its divisors is an integer number (10474350).

Almost surely, 2^31423047 is an apocalyptic number.

31423047 is a deficient number, since it is larger than the sum of its proper divisors (10474353).

31423047 is a wasteful number, since it uses less digits than its factorization.

31423047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10474352.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 31423047 is about 5605.6263699965. The cubic root of 31423047 is about 315.5605940798.

The spelling of 31423047 in words is "thirty-one million, four hundred twenty-three thousand, forty-seven".