221695489 has 4 divisors (see below), whose sum is σ = 221734656. Its totient is φ = 221656324.

The previous prime is 221695483. The next prime is 221695501. The reversal of 221695489 is 984596122.

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 a cyclic number.

It is not a de Polignac number, because 221695489 - 2⁵ = 221695457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221695483) 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, 9289 + ... + 23014.

It is an arithmetic number, because the mean of its divisors is an integer number (55433664).

Almost surely, 2^221695489 is an apocalyptic number.

It is an amenable number.

221695489 is a deficient number, since it is larger than the sum of its proper divisors (39167).

221695489 is an equidigital number, since it uses as much as digits as its factorization.

221695489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39166.

The product of its digits is 311040, while the sum is 46.

The square root of 221695489 is about 14889.4421990886. The cubic root of 221695489 is about 605.2279167690.

The spelling of 221695489 in words is "two hundred twenty-one million, six hundred ninety-five thousand, four hundred eighty-nine".