551800631 has 2 divisors, whose sum is σ = 551800632. Its totient is φ = 551800630.

The previous prime is 551800609. The next prime is 551800643. The reversal of 551800631 is 136008155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551800631 - 2¹⁸ = 551538487 is a prime.

It is a super-2 number, since 2×551800631² = 608967872743996322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 551800594 and 551800603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551800681) 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, 275900315 + 275900316.

It is an arithmetic number, because the mean of its divisors is an integer number (275900316).

Almost surely, 2^551800631 is an apocalyptic number.

551800631 is a deficient number, since it is larger than the sum of its proper divisors (1).

551800631 is an equidigital number, since it uses as much as digits as its factorization.

551800631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 551800631 is about 23490.4370116863. The cubic root of 551800631 is about 820.2144149785.

Adding to 551800631 its reverse (136008155), we get a palindrome (687808786).

The spelling of 551800631 in words is "five hundred fifty-one million, eight hundred thousand, six hundred thirty-one".