506501551 has 2 divisors, whose sum is σ = 506501552. Its totient is φ = 506501550.

The previous prime is 506501539. The next prime is 506501579. The reversal of 506501551 is 155105605.

It is an a-pointer prime, because the next prime (506501579) can be obtained adding 506501551 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 506501551 - 2¹¹ = 506499503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (506501851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253250775 + 253250776.

It is an arithmetic number, because the mean of its divisors is an integer number (253250776).

Almost surely, 2^506501551 is an apocalyptic number.

506501551 is a deficient number, since it is larger than the sum of its proper divisors (1).

506501551 is an equidigital number, since it uses as much as digits as its factorization.

506501551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 506501551 is about 22505.5893279869. The cubic root of 506501551 is about 797.1259113624.

The spelling of 506501551 in words is "five hundred six million, five hundred one thousand, five hundred fifty-one".