221441691 has 8 divisors (see below), whose sum is σ = 300260160. Its totient is φ = 145125512.

The previous prime is 221441681. The next prime is 221441699. The reversal of 221441691 is 196144122.

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 221441691 - 2⁵ = 221441659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221441699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625365 + ... + 625718.

It is an arithmetic number, because the mean of its divisors is an integer number (37532520).

Almost surely, 2^221441691 is an apocalyptic number.

221441691 is a deficient number, since it is larger than the sum of its proper divisors (78818469).

221441691 is a wasteful number, since it uses less digits than its factorization.

221441691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251145.

The product of its digits is 3456, while the sum is 30.

The square root of 221441691 is about 14880.9170080341. The cubic root of 221441691 is about 604.9968726929.

The spelling of 221441691 in words is "two hundred twenty-one million, four hundred forty-one thousand, six hundred ninety-one".