516121691 has 2 divisors, whose sum is σ = 516121692. Its totient is φ = 516121690.

The previous prime is 516121667. The next prime is 516121709. The reversal of 516121691 is 196121615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 516121691 - 2²⁶ = 449012827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (516121601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258060845 + 258060846.

It is an arithmetic number, because the mean of its divisors is an integer number (258060846).

Almost surely, 2^516121691 is an apocalyptic number.

516121691 is a deficient number, since it is larger than the sum of its proper divisors (1).

516121691 is an equidigital number, since it uses as much as digits as its factorization.

516121691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 32.

The square root of 516121691 is about 22718.3117990752. The cubic root of 516121691 is about 802.1409792112.

The spelling of 516121691 in words is "five hundred sixteen million, one hundred twenty-one thousand, six hundred ninety-one".