515672561 has 2 divisors, whose sum is σ = 515672562. Its totient is φ = 515672560.

The previous prime is 515672537. The next prime is 515672593. The reversal of 515672561 is 165276515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342250000 + 173422561 = 18500^2 + 13169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-515672561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (515672501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257836280 + 257836281.

It is an arithmetic number, because the mean of its divisors is an integer number (257836281).

Almost surely, 2^515672561 is an apocalyptic number.

It is an amenable number.

515672561 is a deficient number, since it is larger than the sum of its proper divisors (1).

515672561 is an equidigital number, since it uses as much as digits as its factorization.

515672561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 38.

The square root of 515672561 is about 22708.4248903353. The cubic root of 515672561 is about 801.9082368586.

The spelling of 515672561 in words is "five hundred fifteen million, six hundred seventy-two thousand, five hundred sixty-one".