2145841187161 has 9 divisors (see below), whose sum is σ = 2496194533749. Its totient is φ = 1839283656924.

The previous prime is 2145841187141. The next prime is 2145841187177. The reversal of 2145841187161 is 1617811485412.

The square root of 2145841187161 is 1464869.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2145841187161 - 2²¹ = 2145839090009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (2145841187141) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10149450 + ... + 10358716.

Almost surely, 2^{2145841187161} is an apocalyptic number.

2145841187161 is the 1464869-th square number.

2145841187161 is the 732435-th centered octagonal number.

It is an amenable number.

2145841187161 is a deficient number, since it is larger than the sum of its proper divisors (350353346588).

2145841187161 is an frugal number, since it uses more digits than its factorization.

2145841187161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418548 (or 209274 counting only the distinct ones).

The product of its digits is 430080, while the sum is 49.

Multiplying 2145841187161 by its sum of digits (49), we get a square (105146218170889 = 10254083²).

2145841187161 divided by its sum of digits (49) gives a square (43792677289 = 209267²).

The spelling of 2145841187161 in words is "two trillion, one hundred forty-five billion, eight hundred forty-one million, one hundred eighty-seven thousand, one hundred sixty-one".