213553887 has 8 divisors (see below), whose sum is σ = 285054720. Its totient is φ = 142211160.

The previous prime is 213553861. The next prime is 213553889. The reversal of 213553887 is 788355312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-213553887 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213553889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36337 + ... + 41802.

It is an arithmetic number, because the mean of its divisors is an integer number (35631840).

Almost surely, 2^213553887 is an apocalyptic number.

213553887 is a deficient number, since it is larger than the sum of its proper divisors (71500833).

213553887 is an equidigital number, since it uses as much as digits as its factorization.

213553887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79053.

The product of its digits is 201600, while the sum is 42.

The square root of 213553887 is about 14613.4830550420. The cubic root of 213553887 is about 597.7264765889.

The spelling of 213553887 in words is "two hundred thirteen million, five hundred fifty-three thousand, eight hundred eighty-seven".