1181085537821 has 8 divisors (see below), whose sum is σ = 1355189782464. Its totient is φ = 1008325728000.

The previous prime is 1181085537811. The next prime is 1181085537871. The reversal of 1181085537821 is 1287355801811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1181085537821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1181085537821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181085537811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336106820 + ... + 336110333.

It is an arithmetic number, because the mean of its divisors is an integer number (169398722808).

Almost surely, 2^{1181085537821} is an apocalyptic number.

It is an amenable number.

1181085537821 is a deficient number, since it is larger than the sum of its proper divisors (174104244643).

1181085537821 is an equidigital number, since it uses as much as digits as its factorization.

1181085537821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672217411.

The product of its (nonzero) digits is 537600, while the sum is 50.

The spelling of 1181085537821 in words is "one trillion, one hundred eighty-one billion, eighty-five million, five hundred thirty-seven thousand, eight hundred twenty-one".