551138669 has 2 divisors, whose sum is σ = 551138670. Its totient is φ = 551138668.

The previous prime is 551138663. The next prime is 551138699. The reversal of 551138669 is 966831155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 455822500 + 95316169 = 21350^2 + 9763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551138669 is a prime.

It is a super-2 number, since 2×551138669² = 607507664934183122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551138663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275569334 + 275569335.

It is an arithmetic number, because the mean of its divisors is an integer number (275569335).

Almost surely, 2^551138669 is an apocalyptic number.

It is an amenable number.

551138669 is a deficient number, since it is larger than the sum of its proper divisors (1).

551138669 is an equidigital number, since it uses as much as digits as its factorization.

551138669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 551138669 is about 23476.3427518002. The cubic root of 551138669 is about 819.8862964492.

The spelling of 551138669 in words is "five hundred fifty-one million, one hundred thirty-eight thousand, six hundred sixty-nine".