551144321 has 12 divisors (see below), whose sum is σ = 682060032. Its totient is φ = 436069296.

The previous prime is 551144303. The next prime is 551144323. The reversal of 551144321 is 123441155.

It is a de Polignac number, because none of the positive numbers 2^k-551144321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (551144323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231761 + ... + 234126.

It is an arithmetic number, because the mean of its divisors is an integer number (56838336).

Almost surely, 2^551144321 is an apocalyptic number.

It is an amenable number.

551144321 is a deficient number, since it is larger than the sum of its proper divisors (130915711).

551144321 is a wasteful number, since it uses less digits than its factorization.

551144321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465920 (or 465907 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 551144321 is about 23476.4631279927. The cubic root of 551144321 is about 819.8890991205.

Adding to 551144321 its reverse (123441155), we get a palindrome (674585476).

The spelling of 551144321 in words is "five hundred fifty-one million, one hundred forty-four thousand, three hundred twenty-one".