213444545 has 8 divisors (see below), whose sum is σ = 256213824. Its totient is φ = 170702064.

The previous prime is 213444541. The next prime is 213444557. The reversal of 213444545 is 545444312.

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

It is a cyclic number.

It is not a de Polignac number, because 213444545 - 2² = 213444541 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213444541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22052 + ... + 30218.

It is an arithmetic number, because the mean of its divisors is an integer number (32026728).

Almost surely, 2^213444545 is an apocalyptic number.

It is an amenable number.

213444545 is a deficient number, since it is larger than the sum of its proper divisors (42769279).

213444545 is an equidigital number, since it uses as much as digits as its factorization.

213444545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13399.

The product of its digits is 38400, while the sum is 32.

The square root of 213444545 is about 14609.7414419284. The cubic root of 213444545 is about 597.6244449394.

Adding to 213444545 its reverse (545444312), we get a palindrome (758888857).

The spelling of 213444545 in words is "two hundred thirteen million, four hundred forty-four thousand, five hundred forty-five".