551100321 has 16 divisors (see below), whose sum is σ = 821857920. Its totient is φ = 364964400.

The previous prime is 551100289. The next prime is 551100331. The reversal of 551100321 is 123001155.

It is not a de Polignac number, because 551100321 - 2⁵ = 551100289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 551100294 and 551100303.

It is not an unprimeable number, because it can be changed into a prime (551100331) 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, 63510 + ... + 71663.

It is an arithmetic number, because the mean of its divisors is an integer number (51366120).

Almost surely, 2^551100321 is an apocalyptic number.

It is an amenable number.

551100321 is a deficient number, since it is larger than the sum of its proper divisors (270757599).

551100321 is a wasteful number, since it uses less digits than its factorization.

551100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135333 (or 135327 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 551100321 is about 23475.5260004968. The cubic root of 551100321 is about 819.8672802253.

Adding to 551100321 its reverse (123001155), we get a palindrome (674101476).

The spelling of 551100321 in words is "five hundred fifty-one million, one hundred thousand, three hundred twenty-one".