551403321 has 24 divisors (see below), whose sum is σ = 869747040. Its totient is φ = 309742272.

The previous prime is 551403283. The next prime is 551403371. The reversal of 551403321 is 123304155.

It is not a de Polignac number, because 551403321 - 2¹³ = 551395129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 551403291 and 551403300.

It is not an unprimeable number, because it can be changed into a prime (551403371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23116 + ... + 40461.

It is an arithmetic number, because the mean of its divisors is an integer number (36239460).

Almost surely, 2^551403321 is an apocalyptic number.

It is an amenable number.

551403321 is a deficient number, since it is larger than the sum of its proper divisors (318343719).

551403321 is a wasteful number, since it uses less digits than its factorization.

551403321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63653 (or 63646 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 551403321 is about 23481.9786432064. The cubic root of 551403321 is about 820.0175095408.

Adding to 551403321 its reverse (123304155), we get a palindrome (674707476).

The spelling of 551403321 in words is "five hundred fifty-one million, four hundred three thousand, three hundred twenty-one".