31481636802 has 32 divisors (see below), whose sum is σ = 78499666944. Its totient is φ = 8177048400.

The previous prime is 31481636729. The next prime is 31481636803. The reversal of 31481636802 is 20863618413.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (31481636803) 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 15 ways as a sum of consecutive naturals, for example, 34070574 + ... + 34071497.

It is an arithmetic number, because the mean of its divisors is an integer number (2453114592).

Almost surely, 2^31481636802 is an apocalyptic number.

31481636802 is an abundant number, since it is smaller than the sum of its proper divisors (47018030142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31481636802 is a wasteful number, since it uses less digits than its factorization.

31481636802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68142094.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 31481636802 in words is "thirty-one billion, four hundred eighty-one million, six hundred thirty-six thousand, eight hundred two".