505515947 has 2 divisors, whose sum is σ = 505515948. Its totient is φ = 505515946.

The previous prime is 505515943. The next prime is 505516013. The reversal of 505515947 is 749515505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505515947 - 2² = 505515943 is a prime.

It is not a weakly prime, because it can be changed into another prime (505515943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252757973 + 252757974.

It is an arithmetic number, because the mean of its divisors is an integer number (252757974).

Almost surely, 2^505515947 is an apocalyptic number.

505515947 is a deficient number, since it is larger than the sum of its proper divisors (1).

505515947 is an equidigital number, since it uses as much as digits as its factorization.

505515947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157500, while the sum is 41.

The square root of 505515947 is about 22483.6817936921. The cubic root of 505515947 is about 796.6085318090.

The spelling of 505515947 in words is "five hundred five million, five hundred fifteen thousand, nine hundred forty-seven".