2187089381 has 2 divisors, whose sum is σ = 2187089382. Its totient is φ = 2187089380.

The previous prime is 2187089371. The next prime is 2187089407. The reversal of 2187089381 is 1839807812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2187058756 + 30625 = 46766^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187089381 - 2¹⁰ = 2187088357 is a prime.

It is a super-2 number, since 2×2187089381² = 9566719920965926322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2187089341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093544690 + 1093544691.

It is an arithmetic number, because the mean of its divisors is an integer number (1093544691).

Almost surely, 2^2187089381 is an apocalyptic number.

It is an amenable number.

2187089381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187089381 is an equidigital number, since it uses as much as digits as its factorization.

2187089381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 2187089381 is about 46766.3274268998. The cubic root of 2187089381 is about 1298.0422961234.

The spelling of 2187089381 in words is "two billion, one hundred eighty-seven million, eighty-nine thousand, three hundred eighty-one".