2187384798361 has 9 divisors (see below), whose sum is σ = 2544520890261. Its totient is φ = 1874892381852.

The previous prime is 2187384798341. The next prime is 2187384798373. The reversal of 2187384798361 is 1638974837812.

The square root of 2187384798361 is 1478981.

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

It is a de Polignac number, because none of the positive numbers 2^k-2187384798361 is a prime.

It is a super-2 number, since 2×2187384798361² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2187384798311) 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 8 ways as a sum of consecutive naturals, for example, 10247226 + ... + 10458508.

Almost surely, 2^{2187384798361} is an apocalyptic number.

2187384798361 is the 1478981-st square number.

2187384798361 is the 739491-st centered octagonal number.

It is an amenable number.

2187384798361 is a deficient number, since it is larger than the sum of its proper divisors (357136091900).

2187384798361 is an frugal number, since it uses more digits than its factorization.

2187384798361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422580 (or 211290 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 67.

The spelling of 2187384798361 in words is "two trillion, one hundred eighty-seven billion, three hundred eighty-four million, seven hundred ninety-eight thousand, three hundred sixty-one".