505254551 has 2 divisors, whose sum is σ = 505254552. Its totient is φ = 505254550.

The previous prime is 505254539. The next prime is 505254553. The reversal of 505254551 is 155452505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505254551 - 2⁶ = 505254487 is a prime.

It is a super-2 number, since 2×505254551² = 510564322612423202, which contains 22 as substring.

Together with 505254553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505254553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252627275 + 252627276.

It is an arithmetic number, because the mean of its divisors is an integer number (252627276).

Almost surely, 2^505254551 is an apocalyptic number.

505254551 is a deficient number, since it is larger than the sum of its proper divisors (1).

505254551 is an equidigital number, since it uses as much as digits as its factorization.

505254551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25000, while the sum is 32.

The square root of 505254551 is about 22477.8680261274. The cubic root of 505254551 is about 796.4712026859.

The spelling of 505254551 in words is "five hundred five million, two hundred fifty-four thousand, five hundred fifty-one".