220944391 has 4 divisors (see below), whose sum is σ = 220974912. Its totient is φ = 220913872.

The previous prime is 220944377. The next prime is 220944401. The reversal of 220944391 is 193449022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 220944391 - 2¹⁵ = 220911623 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 (220944491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2451 + ... + 21163.

It is an arithmetic number, because the mean of its divisors is an integer number (55243728).

Almost surely, 2^220944391 is an apocalyptic number.

220944391 is a deficient number, since it is larger than the sum of its proper divisors (30521).

220944391 is a wasteful number, since it uses less digits than its factorization.

220944391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30520.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 220944391 is about 14864.1982965783. The cubic root of 220944391 is about 604.5436451094.

The spelling of 220944391 in words is "two hundred twenty million, nine hundred forty-four thousand, three hundred ninety-one".