221790959 has 16 divisors (see below), whose sum is σ = 253707552. Its totient is φ = 192073728.

The previous prime is 221790941. The next prime is 221790967. The reversal of 221790959 is 959097122.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221790959 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 (221790929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76592 + ... + 79434.

It is an arithmetic number, because the mean of its divisors is an integer number (15856722).

Almost surely, 2^221790959 is an apocalyptic number.

221790959 is a deficient number, since it is larger than the sum of its proper divisors (31916593).

221790959 is a wasteful number, since it uses less digits than its factorization.

221790959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 221790959 is about 14892.6478169599. The cubic root of 221790959 is about 605.3147818908.

The spelling of 221790959 in words is "two hundred twenty-one million, seven hundred ninety thousand, nine hundred fifty-nine".