220431551 has 8 divisors (see below), whose sum is σ = 227655360. Its totient is φ = 213313408.

The previous prime is 220431529. The next prime is 220431569. The reversal of 220431551 is 155134022.

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 220431551 - 2¹⁰ = 220430527 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 (220431511) 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, 22166 + ... + 30531.

It is an arithmetic number, because the mean of its divisors is an integer number (28456920).

Almost surely, 2^220431551 is an apocalyptic number.

220431551 is a deficient number, since it is larger than the sum of its proper divisors (7223809).

220431551 is an equidigital number, since it uses as much as digits as its factorization.

220431551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52833.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 220431551 is about 14846.9374283049. The cubic root of 220431551 is about 604.0755418798.

Adding to 220431551 its reverse (155134022), we get a palindrome (375565573).

The spelling of 220431551 in words is "two hundred twenty million, four hundred thirty-one thousand, five hundred fifty-one".