516451561 has 2 divisors, whose sum is σ = 516451562. Its totient is φ = 516451560.

The previous prime is 516451553. The next prime is 516451577. The reversal of 516451561 is 165154615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309091561 + 207360000 = 17581^2 + 14400^2 .

It is a cyclic number.

It is not a de Polignac number, because 516451561 - 2³ = 516451553 is a prime.

It is not a weakly prime, because it can be changed into another prime (516451531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258225780 + 258225781.

It is an arithmetic number, because the mean of its divisors is an integer number (258225781).

Almost surely, 2^516451561 is an apocalyptic number.

It is an amenable number.

516451561 is a deficient number, since it is larger than the sum of its proper divisors (1).

516451561 is an equidigital number, since it uses as much as digits as its factorization.

516451561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 34.

The square root of 516451561 is about 22725.5706419003. The cubic root of 516451561 is about 802.3118341972.

The spelling of 516451561 in words is "five hundred sixteen million, four hundred fifty-one thousand, five hundred sixty-one".