220831261 has 8 divisors (see below), whose sum is σ = 254073600. Its totient is φ = 188012688.

The previous prime is 220831253. The next prime is 220831291. The reversal of 220831261 is 162138022.

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 220831261 - 2³ = 220831253 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 (220831291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104821 + ... + 106906.

It is an arithmetic number, because the mean of its divisors is an integer number (31759200).

Almost surely, 2^220831261 is an apocalyptic number.

It is an amenable number.

220831261 is a deficient number, since it is larger than the sum of its proper divisors (33242339).

220831261 is a wasteful number, since it uses less digits than its factorization.

220831261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211883.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 220831261 is about 14860.3923568660. The cubic root of 220831261 is about 604.4404461423.

Adding to 220831261 its reverse (162138022), we get a palindrome (382969283).

The spelling of 220831261 in words is "two hundred twenty million, eight hundred thirty-one thousand, two hundred sixty-one".