220145551 has 2 divisors, whose sum is σ = 220145552. Its totient is φ = 220145550.

The previous prime is 220145543. The next prime is 220145567. The reversal of 220145551 is 155541022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220145551 - 2³ = 220145543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220145521) 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 as a sum of consecutive naturals, namely, 110072775 + 110072776.

It is an arithmetic number, because the mean of its divisors is an integer number (110072776).

Almost surely, 2^220145551 is an apocalyptic number.

220145551 is a deficient number, since it is larger than the sum of its proper divisors (1).

220145551 is an equidigital number, since it uses as much as digits as its factorization.

220145551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 220145551 is about 14837.3026861354. The cubic root of 220145551 is about 603.8141752157.

Adding to 220145551 its reverse (155541022), we get a palindrome (375686573).

The spelling of 220145551 in words is "two hundred twenty million, one hundred forty-five thousand, five hundred fifty-one".