213540287 has 2 divisors, whose sum is σ = 213540288. Its totient is φ = 213540286.

The previous prime is 213540277. The next prime is 213540337. The reversal of 213540287 is 782045312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213540287 - 2²⁴ = 196763071 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213540277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106770143 + 106770144.

It is an arithmetic number, because the mean of its divisors is an integer number (106770144).

Almost surely, 2^213540287 is an apocalyptic number.

213540287 is a deficient number, since it is larger than the sum of its proper divisors (1).

213540287 is an equidigital number, since it uses as much as digits as its factorization.

213540287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 213540287 is about 14613.0177239337. The cubic root of 213540287 is about 597.7137877499.

Adding to 213540287 its reverse (782045312), we get a palindrome (995585599).

The spelling of 213540287 in words is "two hundred thirteen million, five hundred forty thousand, two hundred eighty-seven".