215042687 has 2 divisors, whose sum is σ = 215042688. Its totient is φ = 215042686.

The previous prime is 215042651. The next prime is 215042689. The reversal of 215042687 is 786240512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215042687 - 2¹⁰ = 215041663 is a prime.

Together with 215042689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215042689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107521343 + 107521344.

It is an arithmetic number, because the mean of its divisors is an integer number (107521344).

Almost surely, 2^215042687 is an apocalyptic number.

215042687 is a deficient number, since it is larger than the sum of its proper divisors (1).

215042687 is an equidigital number, since it uses as much as digits as its factorization.

215042687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 215042687 is about 14664.3338409898. Note that the first 3 decimals coincide. The cubic root of 215042687 is about 599.1122863292.

The spelling of 215042687 in words is "two hundred fifteen million, forty-two thousand, six hundred eighty-seven".