505557649 has 2 divisors, whose sum is σ = 505557650. Its totient is φ = 505557648.

The previous prime is 505557629. The next prime is 505557653. The reversal of 505557649 is 946755505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 464187025 + 41370624 = 21545^2 + 6432^2 .

It is a cyclic number.

It is not a de Polignac number, because 505557649 - 2⁵ = 505557617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505557599 and 505557608.

It is not a weakly prime, because it can be changed into another prime (505557629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252778824 + 252778825.

It is an arithmetic number, because the mean of its divisors is an integer number (252778825).

Almost surely, 2^505557649 is an apocalyptic number.

It is an amenable number.

505557649 is a deficient number, since it is larger than the sum of its proper divisors (1).

505557649 is an equidigital number, since it uses as much as digits as its factorization.

505557649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 945000, while the sum is 46.

The square root of 505557649 is about 22484.6091582665. The cubic root of 505557649 is about 796.6304363310.

The spelling of 505557649 in words is "five hundred five million, five hundred fifty-seven thousand, six hundred forty-nine".