213717623 has 4 divisors (see below), whose sum is σ = 244248720. Its totient is φ = 183186528.

The previous prime is 213717583. The next prime is 213717629. The reversal of 213717623 is 326717312.

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

It is not a de Polignac number, because 213717623 - 2¹² = 213713527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213717623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213717629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15265538 + ... + 15265551.

It is an arithmetic number, because the mean of its divisors is an integer number (61062180).

Almost surely, 2^213717623 is an apocalyptic number.

213717623 is a deficient number, since it is larger than the sum of its proper divisors (30531097).

213717623 is an equidigital number, since it uses as much as digits as its factorization.

213717623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30531096.

The product of its digits is 10584, while the sum is 32.

The square root of 213717623 is about 14619.0842052435. The cubic root of 213717623 is about 597.8792004776.

The spelling of 213717623 in words is "two hundred thirteen million, seven hundred seventeen thousand, six hundred twenty-three".