31321947 has 8 divisors (see below), whose sum is σ = 41844544. Its totient is φ = 20840328.

The previous prime is 31321919. The next prime is 31321949. The reversal of 31321947 is 74912313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31321947 - 2⁸ = 31321691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8413 + ... + 11550.

It is an arithmetic number, because the mean of its divisors is an integer number (5230568).

Almost surely, 2^31321947 is an apocalyptic number.

31321947 is a deficient number, since it is larger than the sum of its proper divisors (10522597).

31321947 is a wasteful number, since it uses less digits than its factorization.

31321947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20489.

The product of its digits is 4536, while the sum is 30.

The square root of 31321947 is about 5596.6013794088. The cubic root of 31321947 is about 315.2218039739.

The spelling of 31321947 in words is "thirty-one million, three hundred twenty-one thousand, nine hundred forty-seven".