2187247841 has 2 divisors, whose sum is σ = 2187247842. Its totient is φ = 2187247840.

The previous prime is 2187247837. The next prime is 2187247861. The reversal of 2187247841 is 1487427812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1837408225 + 349839616 = 42865^2 + 18704^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187247841 - 2² = 2187247837 is a prime.

It is a super-2 number, since 2×2187247841² = 9568106235918322562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2187247792 and 2187247801.

It is not a weakly prime, because it can be changed into another prime (2187247861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093623920 + 1093623921.

It is an arithmetic number, because the mean of its divisors is an integer number (1093623921).

Almost surely, 2^2187247841 is an apocalyptic number.

It is an amenable number.

2187247841 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187247841 is an equidigital number, since it uses as much as digits as its factorization.

2187247841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200704, while the sum is 44.

The square root of 2187247841 is about 46768.0215638849. The cubic root of 2187247841 is about 1298.0736441510.

The spelling of 2187247841 in words is "two billion, one hundred eighty-seven million, two hundred forty-seven thousand, eight hundred forty-one".