1213801849161 has 24 divisors (see below), whose sum is σ = 1976561326880. Its totient is φ = 735637482360.

The previous prime is 1213801849159. The next prime is 1213801849187. The reversal of 1213801849161 is 1619481083121.

1213801849161 is a `hidden beast` number, since 1 + 2 + 1 + 380 + 184 + 91 + 6 + 1 = 666.

It is not a de Polignac number, because 1213801849161 - 2¹ = 1213801849159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213801849261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185763775 + ... + 185770308.

Almost surely, 2^{1213801849161} is an apocalyptic number.

1213801849161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213801849161 is a deficient number, since it is larger than the sum of its proper divisors (762759477719).

1213801849161 is a wasteful number, since it uses less digits than its factorization.

1213801849161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371534114 (or 371534097 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 1213801849161 in words is "one trillion, two hundred thirteen billion, eight hundred one million, eight hundred forty-nine thousand, one hundred sixty-one".