31972747 has 4 divisors (see below), whose sum is σ = 32105656. Its totient is φ = 31839840.

The previous prime is 31972741. The next prime is 31972753. The reversal of 31972747 is 74727913.

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

It is an interprime number because it is at equal distance from previous prime (31972741) and next prime (31972753).

It is a cyclic number.

It is not a de Polignac number, because 31972747 - 2¹¹ = 31970699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31972741) 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, 66093 + ... + 66574.

It is an arithmetic number, because the mean of its divisors is an integer number (8026414).

Almost surely, 2^31972747 is an apocalyptic number.

31972747 is a deficient number, since it is larger than the sum of its proper divisors (132909).

31972747 is a wasteful number, since it uses less digits than its factorization.

31972747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132908.

The product of its digits is 74088, while the sum is 40.

The square root of 31972747 is about 5654.4448887579. Note that the first 3 decimals coincide. The cubic root of 31972747 is about 317.3900567937.

The spelling of 31972747 in words is "thirty-one million, nine hundred seventy-two thousand, seven hundred forty-seven".