31980847 has 4 divisors (see below), whose sum is σ = 32002776. Its totient is φ = 31958920.

The previous prime is 31980749. The next prime is 31980853. The reversal of 31980847 is 74808913.

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 31980847 - 2⁷ = 31980719 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 (31980877) 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 3 ways as a sum of consecutive naturals, for example, 8608 + ... + 11749.

It is an arithmetic number, because the mean of its divisors is an integer number (8000694).

Almost surely, 2^31980847 is an apocalyptic number.

31980847 is a deficient number, since it is larger than the sum of its proper divisors (21929).

31980847 is a wasteful number, since it uses less digits than its factorization.

31980847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21928.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 31980847 is about 5655.1610940803. The cubic root of 31980847 is about 317.4168571433.

The spelling of 31980847 in words is "thirty-one million, nine hundred eighty thousand, eight hundred forty-seven".