31429215018 has 48 divisors (see below), whose sum is σ = 72670141440. Its totient is φ = 9782494848.

The previous prime is 31429214989. The next prime is 31429215019. The reversal of 31429215018 is 81051292413.

31429215018 is a `hidden beast` number, since 3 + 1 + 429 + 215 + 0 + 18 = 666.

It is not an unprimeable number, because it can be changed into a prime (31429215019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 365508 + ... + 443231.

It is an arithmetic number, because the mean of its divisors is an integer number (1513961280).

Almost surely, 2^31429215018 is an apocalyptic number.

31429215018 is an abundant number, since it is smaller than the sum of its proper divisors (41240926422).

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

31429215018 is a wasteful number, since it uses less digits than its factorization.

31429215018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808891 (or 808888 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 31429215018 in words is "thirty-one billion, four hundred twenty-nine million, two hundred fifteen thousand, eighteen".