551345231 has 2 divisors, whose sum is σ = 551345232. Its totient is φ = 551345230.

The previous prime is 551345161. The next prime is 551345233. The reversal of 551345231 is 132543155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551345231 is a prime.

It is a super-2 number, since 2×551345231² = 607963127492886722, which contains 22 as substring.

Together with 551345233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 551345194 and 551345203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551345233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275672615 + 275672616.

It is an arithmetic number, because the mean of its divisors is an integer number (275672616).

Almost surely, 2^551345231 is an apocalyptic number.

551345231 is a deficient number, since it is larger than the sum of its proper divisors (1).

551345231 is an equidigital number, since it uses as much as digits as its factorization.

551345231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 29.

The square root of 551345231 is about 23480.7417046396. The cubic root of 551345231 is about 819.9887124165.

Adding to 551345231 its reverse (132543155), we get a palindrome (683888386).

The spelling of 551345231 in words is "five hundred fifty-one million, three hundred forty-five thousand, two hundred thirty-one".