1181417307861 has 32 divisors (see below), whose sum is σ = 1881961555968. Its totient is φ = 644562959040.

The previous prime is 1181417307841. The next prime is 1181417307883. The reversal of 1181417307861 is 1687037141811.

It is not a de Polignac number, because 1181417307861 - 2¹¹ = 1181417305813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1181417307861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181417307841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1971630 + ... + 2500031.

It is an arithmetic number, because the mean of its divisors is an integer number (58811298624).

Almost surely, 2^{1181417307861} is an apocalyptic number.

It is an amenable number.

1181417307861 is a deficient number, since it is larger than the sum of its proper divisors (700544248107).

1181417307861 is a wasteful number, since it uses less digits than its factorization.

1181417307861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472241.

The product of its (nonzero) digits is 225792, while the sum is 48.

The spelling of 1181417307861 in words is "one trillion, one hundred eighty-one billion, four hundred seventeen million, three hundred seven thousand, eight hundred sixty-one".