31820678671 has 4 divisors (see below), whose sum is σ = 31900831912. Its totient is φ = 31740525432.

The previous prime is 31820678663. The next prime is 31820678677. The reversal of 31820678671 is 17687602813.

It is a happy number.

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 31820678671 - 2³ = 31820678663 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 (31820678677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40076025 + ... + 40076818.

It is an arithmetic number, because the mean of its divisors is an integer number (7975207978).

Almost surely, 2^31820678671 is an apocalyptic number.

31820678671 is a deficient number, since it is larger than the sum of its proper divisors (80153241).

31820678671 is an equidigital number, since it uses as much as digits as its factorization.

31820678671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80153240.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 31820678671 in words is "thirty-one billion, eight hundred twenty million, six hundred seventy-eight thousand, six hundred seventy-one".