2187436987 has 2 divisors, whose sum is σ = 2187436988. Its totient is φ = 2187436986.

The previous prime is 2187436967. The next prime is 2187437033. The reversal of 2187436987 is 7896347812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2187436987 - 2¹⁹ = 2186912699 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2187436957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093718493 + 1093718494.

It is an arithmetic number, because the mean of its divisors is an integer number (1093718494).

Almost surely, 2^2187436987 is an apocalyptic number.

2187436987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187436987 is an equidigital number, since it uses as much as digits as its factorization.

2187436987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 55.

The square root of 2187436987 is about 46770.0436925175. The cubic root of 2187436987 is about 1298.1110607857. Note that the first 3 decimals are identical.

The spelling of 2187436987 in words is "two billion, one hundred eighty-seven million, four hundred thirty-six thousand, nine hundred eighty-seven".