2180144381 has 2 divisors, whose sum is σ = 2180144382. Its totient is φ = 2180144380.

The previous prime is 2180144353. The next prime is 2180144399. The reversal of 2180144381 is 1834410812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1971804025 + 208340356 = 44405^2 + 14434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2180144381 is a prime.

It is a super-2 number, since 2×2180144381² = 9506059044011746322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2180144881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090072190 + 1090072191.

It is an arithmetic number, because the mean of its divisors is an integer number (1090072191).

Almost surely, 2^2180144381 is an apocalyptic number.

It is an amenable number.

2180144381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180144381 is an equidigital number, since it uses as much as digits as its factorization.

2180144381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 2180144381 is about 46692.0162447500. The cubic root of 2180144381 is about 1296.6668817135. Note that the first 3 decimals are identical.

The spelling of 2180144381 in words is "two billion, one hundred eighty million, one hundred forty-four thousand, three hundred eighty-one".