516561407 has 4 divisors (see below), whose sum is σ = 517516776. Its totient is φ = 515606040.

The previous prime is 516561317. The next prime is 516561413. The reversal of 516561407 is 704165615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 516561407 - 2¹⁴ = 516545023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516561467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476873 + ... + 477954.

It is an arithmetic number, because the mean of its divisors is an integer number (129379194).

Almost surely, 2^516561407 is an apocalyptic number.

516561407 is a deficient number, since it is larger than the sum of its proper divisors (955369).

516561407 is an equidigital number, since it uses as much as digits as its factorization.

516561407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955368.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 516561407 is about 22727.9873064027. The cubic root of 516561407 is about 802.3687123924.

The spelling of 516561407 in words is "five hundred sixteen million, five hundred sixty-one thousand, four hundred seven".