216145573 has 4 divisors (see below), whose sum is σ = 247023520. Its totient is φ = 185267628.

The previous prime is 216145561. The next prime is 216145591. The reversal of 216145573 is 375541612.

216145573 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216145573 - 2¹³ = 216137381 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 (216145073) 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, 15438963 + ... + 15438976.

It is an arithmetic number, because the mean of its divisors is an integer number (61755880).

Almost surely, 2^216145573 is an apocalyptic number.

It is an amenable number.

216145573 is a deficient number, since it is larger than the sum of its proper divisors (30877947).

216145573 is an equidigital number, since it uses as much as digits as its factorization.

216145573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30877946.

The product of its digits is 25200, while the sum is 34.

The square root of 216145573 is about 14701.8901165802. The cubic root of 216145573 is about 600.1347595457.

The spelling of 216145573 in words is "two hundred sixteen million, one hundred forty-five thousand, five hundred seventy-three".