516555491 has 2 divisors, whose sum is σ = 516555492. Its totient is φ = 516555490.

The previous prime is 516555467. The next prime is 516555497. The reversal of 516555491 is 194555615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516555491 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (516555497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258277745 + 258277746.

It is an arithmetic number, because the mean of its divisors is an integer number (258277746).

Almost surely, 2^516555491 is an apocalyptic number.

516555491 is a deficient number, since it is larger than the sum of its proper divisors (1).

516555491 is an equidigital number, since it uses as much as digits as its factorization.

516555491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135000, while the sum is 41.

The square root of 516555491 is about 22727.8571581221. The cubic root of 516555491 is about 802.3656492965.

The spelling of 516555491 in words is "five hundred sixteen million, five hundred fifty-five thousand, four hundred ninety-one".