31820478851 has 8 divisors (see below), whose sum is σ = 36367340640. Its totient is φ = 27273886848.

The previous prime is 31820478769. The next prime is 31820478869. The reversal of 31820478851 is 15887402813.

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

It is a cyclic number.

It is not a de Polignac number, because 31820478851 - 2¹⁰ = 31820477827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31820478796 and 31820478805.

It is not an unprimeable number, because it can be changed into a prime (31820478451) 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, 425885 + ... + 494993.

It is an arithmetic number, because the mean of its divisors is an integer number (4545917580).

Almost surely, 2^31820478851 is an apocalyptic number.

31820478851 is a deficient number, since it is larger than the sum of its proper divisors (4546861789).

31820478851 is an equidigital number, since it uses as much as digits as its factorization.

31820478851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134893.

The product of its (nonzero) digits is 430080, while the sum is 47.

The spelling of 31820478851 in words is "thirty-one billion, eight hundred twenty million, four hundred seventy-eight thousand, eight hundred fifty-one".