31854884857 has 4 divisors (see below), whose sum is σ = 31862442996. Its totient is φ = 31847326720.

The previous prime is 31854884833. The next prime is 31854884879. The reversal of 31854884857 is 75848845813.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13396673536 + 18458211321 = 115744^2 + 135861^2 .

It is a cyclic number.

It is not a de Polignac number, because 31854884857 - 2¹¹ = 31854882809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31854884795 and 31854884804.

It is not an unprimeable number, because it can be changed into a prime (31854884807) 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, 3772744 + ... + 3781177.

It is an arithmetic number, because the mean of its divisors is an integer number (7965610749).

Almost surely, 2^31854884857 is an apocalyptic number.

It is an amenable number.

31854884857 is a deficient number, since it is larger than the sum of its proper divisors (7558139).

31854884857 is an equidigital number, since it uses as much as digits as its factorization.

31854884857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7558138.

The product of its digits is 34406400, while the sum is 61.

The spelling of 31854884857 in words is "thirty-one billion, eight hundred fifty-four million, eight hundred eighty-four thousand, eight hundred fifty-seven".