505500551 has 2 divisors, whose sum is σ = 505500552. Its totient is φ = 505500550.

The previous prime is 505500533. The next prime is 505500553. The reversal of 505500551 is 155005505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505500551 - 2¹⁴ = 505484167 is a prime.

It is a super-2 number, since 2×505500551² = 511061614122607202, which contains 22 as substring.

Together with 505500553, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505500551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505500553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252750275 + 252750276.

It is an arithmetic number, because the mean of its divisors is an integer number (252750276).

Almost surely, 2^505500551 is an apocalyptic number.

505500551 is a deficient number, since it is larger than the sum of its proper divisors (1).

505500551 is an equidigital number, since it uses as much as digits as its factorization.

505500551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3125, while the sum is 26.

The square root of 505500551 is about 22483.3394094383. The cubic root of 505500551 is about 796.6004445538.

The spelling of 505500551 in words is "five hundred five million, five hundred thousand, five hundred fifty-one".