511687061 has 2 divisors, whose sum is σ = 511687062. Its totient is φ = 511687060.

The previous prime is 511687037. The next prime is 511687087. The reversal of 511687061 is 160786115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341880100 + 169806961 = 18490^2 + 13031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511687061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (511647061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255843530 + 255843531.

It is an arithmetic number, because the mean of its divisors is an integer number (255843531).

Almost surely, 2^511687061 is an apocalyptic number.

It is an amenable number.

511687061 is a deficient number, since it is larger than the sum of its proper divisors (1).

511687061 is an equidigital number, since it uses as much as digits as its factorization.

511687061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 511687061 is about 22620.5009007316. The cubic root of 511687061 is about 799.8369777194.

The spelling of 511687061 in words is "five hundred eleven million, six hundred eighty-seven thousand, sixty-one".