213400087 has 2 divisors, whose sum is σ = 213400088. Its totient is φ = 213400086.

The previous prime is 213400081. The next prime is 213400139. The reversal of 213400087 is 780004312.

213400087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213400087 - 2⁷ = 213399959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213400081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106700043 + 106700044.

It is an arithmetic number, because the mean of its divisors is an integer number (106700044).

Almost surely, 2^213400087 is an apocalyptic number.

213400087 is a deficient number, since it is larger than the sum of its proper divisors (1).

213400087 is an equidigital number, since it uses as much as digits as its factorization.

213400087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 213400087 is about 14608.2198436360. The cubic root of 213400087 is about 597.5829493330.

Adding to 213400087 its reverse (780004312), we get a palindrome (993404399).

The spelling of 213400087 in words is "two hundred thirteen million, four hundred thousand, eighty-seven".