216513723 has 4 divisors (see below), whose sum is σ = 288684968. Its totient is φ = 144342480.

The previous prime is 216513709. The next prime is 216513733. The reversal of 216513723 is 327315612.

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

It is not a de Polignac number, because 216513723 - 2⁵ = 216513691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216513733) 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 in 3 ways as a sum of consecutive naturals, for example, 36085618 + ... + 36085623.

It is an arithmetic number, because the mean of its divisors is an integer number (72171242).

Almost surely, 2^216513723 is an apocalyptic number.

216513723 is a deficient number, since it is larger than the sum of its proper divisors (72171245).

216513723 is an equidigital number, since it uses as much as digits as its factorization.

216513723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72171244.

The product of its digits is 7560, while the sum is 30.

The square root of 216513723 is about 14714.4052886958. The cubic root of 216513723 is about 600.4752928396.

The spelling of 216513723 in words is "two hundred sixteen million, five hundred thirteen thousand, seven hundred twenty-three".