219920945 has 8 divisors (see below), whose sum is σ = 263989800. Its totient is φ = 175880320.

The previous prime is 219920893. The next prime is 219920971. The reversal of 219920945 is 549029912.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 107412496 + 112508449 = 10364^2 + 10607^2 .

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

It is not a de Polignac number, because 219920945 - 2²⁶ = 152812081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18515 + ... + 27975.

It is an arithmetic number, because the mean of its divisors is an integer number (32998725).

Almost surely, 2^219920945 is an apocalyptic number.

It is an amenable number.

219920945 is a deficient number, since it is larger than the sum of its proper divisors (44068855).

219920945 is an equidigital number, since it uses as much as digits as its factorization.

219920945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14115.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 219920945 is about 14829.7317912361. The cubic root of 219920945 is about 603.6087559149.

The spelling of 219920945 in words is "two hundred nineteen million, nine hundred twenty thousand, nine hundred forty-five".