551321231 has 2 divisors, whose sum is σ = 551321232. Its totient is φ = 551321230.

The previous prime is 551321227. The next prime is 551321273. The reversal of 551321231 is 132123155.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551321231 - 2² = 551321227 is a prime.

It is a super-2 number, since 2×551321231² = 607910199502710722, which contains 22 as substring.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 551321197 and 551321206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551321831) 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, 275660615 + 275660616.

It is an arithmetic number, because the mean of its divisors is an integer number (275660616).

Almost surely, 2^551321231 is an apocalyptic number.

551321231 is a deficient number, since it is larger than the sum of its proper divisors (1).

551321231 is an equidigital number, since it uses as much as digits as its factorization.

551321231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 551321231 is about 23480.2306419677. The cubic root of 551321231 is about 819.9768142364.

Adding to 551321231 its reverse (132123155), we get a palindrome (683444386).

The spelling of 551321231 in words is "five hundred fifty-one million, three hundred twenty-one thousand, two hundred thirty-one".