551129869 has 2 divisors, whose sum is σ = 551129870. Its totient is φ = 551129868.

The previous prime is 551129867. The next prime is 551129879. The reversal of 551129869 is 968921155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459544969 + 91584900 = 21437^2 + 9570^2 .

It is a cyclic number.

It is not a de Polignac number, because 551129869 - 2¹ = 551129867 is a prime.

It is a super-2 number, since 2×551129869² = 607488265007914322, which contains 22 as substring.

Together with 551129867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551129861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275564934 + 275564935.

It is an arithmetic number, because the mean of its divisors is an integer number (275564935).

Almost surely, 2^551129869 is an apocalyptic number.

It is an amenable number.

551129869 is a deficient number, since it is larger than the sum of its proper divisors (1).

551129869 is an equidigital number, since it uses as much as digits as its factorization.

551129869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 46.

The square root of 551129869 is about 23476.1553283326. The cubic root of 551129869 is about 819.8819327333.

The spelling of 551129869 in words is "five hundred fifty-one million, one hundred twenty-nine thousand, eight hundred sixty-nine".