31820478811 has 8 divisors (see below), whose sum is σ = 34841346048. Its totient is φ = 28820961000.

The previous prime is 31820478769. The next prime is 31820478869. The reversal of 31820478811 is 11887402813.

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 31820478811 - 2¹⁵ = 31820446043 is a prime.

It is a super-2 number, since 2×31820478811² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31820478611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5334235 + ... + 5340196.

It is an arithmetic number, because the mean of its divisors is an integer number (4355168256).

Almost surely, 2^31820478811 is an apocalyptic number.

31820478811 is a deficient number, since it is larger than the sum of its proper divisors (3020867237).

31820478811 is a wasteful number, since it uses less digits than its factorization.

31820478811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10674713.

The product of its (nonzero) digits is 86016, while the sum is 43.

The spelling of 31820478811 in words is "thirty-one billion, eight hundred twenty million, four hundred seventy-eight thousand, eight hundred eleven".