208731211542 has 48 divisors (see below), whose sum is σ = 523085472000. Its totient is φ = 58918962096.

The previous prime is 208731211511. The next prime is 208731211553. The reversal of 208731211542 is 245112137802.

208731211542 is a `hidden beast` number, since 2 + 0 + 87 + 31 + 2 + 1 + 1 + 542 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 208731211497 and 208731211506.

It is a congruent number.

It is an unprimeable number.

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, 9969042 + ... + 9989957.

It is an arithmetic number, because the mean of its divisors is an integer number (10897614000).

Almost surely, 2^208731211542 is an apocalyptic number.

208731211542 is an abundant number, since it is smaller than the sum of its proper divisors (314354260458).

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

208731211542 is a wasteful number, since it uses less digits than its factorization.

208731211542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19959097 (or 19959094 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 208731211542 in words is "two hundred eight billion, seven hundred thirty-one million, two hundred eleven thousand, five hundred forty-two".