121800537539 has 4 divisors (see below), whose sum is σ = 121812615456. Its totient is φ = 121788459624.

The previous prime is 121800537511. The next prime is 121800537541. The reversal of 121800537539 is 935735008121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121800537539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121800537539.

It is not an unprimeable number, because it can be changed into a prime (121800537239) 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, 6023819 + ... + 6044004.

It is an arithmetic number, because the mean of its divisors is an integer number (30453153864).

Almost surely, 2^121800537539 is an apocalyptic number.

121800537539 is a deficient number, since it is larger than the sum of its proper divisors (12077917).

121800537539 is a wasteful number, since it uses less digits than its factorization.

121800537539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12077916.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 121800537539 in words is "one hundred twenty-one billion, eight hundred million, five hundred thirty-seven thousand, five hundred thirty-nine".