215123087 has 2 divisors, whose sum is σ = 215123088. Its totient is φ = 215123086.

The previous prime is 215123033. The next prime is 215123093. The reversal of 215123087 is 780321512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215123087 - 2¹⁶ = 215057551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215153087) 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, 107561543 + 107561544.

It is an arithmetic number, because the mean of its divisors is an integer number (107561544).

Almost surely, 2^215123087 is an apocalyptic number.

215123087 is a deficient number, since it is larger than the sum of its proper divisors (1).

215123087 is an equidigital number, since it uses as much as digits as its factorization.

215123087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 215123087 is about 14667.0749299238. The cubic root of 215123087 is about 599.1869422447.

Adding to 215123087 its reverse (780321512), we get a palindrome (995444599).

The spelling of 215123087 in words is "two hundred fifteen million, one hundred twenty-three thousand, eighty-seven".