213987523 has 4 divisors (see below), whose sum is σ = 214223328. Its totient is φ = 213751720.

The previous prime is 213987511. The next prime is 213987559. The reversal of 213987523 is 325789312.

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

It is a cyclic number.

It is not a de Polignac number, because 213987523 - 2¹³ = 213979331 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213987503) 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, 116536 + ... + 118357.

It is an arithmetic number, because the mean of its divisors is an integer number (53555832).

Almost surely, 2^213987523 is an apocalyptic number.

213987523 is a deficient number, since it is larger than the sum of its proper divisors (235805).

213987523 is an equidigital number, since it uses as much as digits as its factorization.

213987523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235804.

The product of its digits is 90720, while the sum is 40.

The square root of 213987523 is about 14628.3123770311. The cubic root of 213987523 is about 598.1307781001.

The spelling of 213987523 in words is "two hundred thirteen million, nine hundred eighty-seven thousand, five hundred twenty-three".