213910887 has 4 divisors (see below), whose sum is σ = 285214520. Its totient is φ = 142607256.

The previous prime is 213910861. The next prime is 213910891. The reversal of 213910887 is 788019312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 213910887 - 2¹⁹ = 213386599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213910897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35651812 + ... + 35651817.

It is an arithmetic number, because the mean of its divisors is an integer number (71303630).

Almost surely, 2^213910887 is an apocalyptic number.

213910887 is a deficient number, since it is larger than the sum of its proper divisors (71303633).

213910887 is an equidigital number, since it uses as much as digits as its factorization.

213910887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71303632.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 213910887 is about 14625.6927015441. The cubic root of 213910887 is about 598.0593661118.

The spelling of 213910887 in words is "two hundred thirteen million, nine hundred ten thousand, eight hundred eighty-seven".