686504141 has 2 divisors, whose sum is σ = 686504142. Its totient is φ = 686504140.

The previous prime is 686504129. The next prime is 686504173. The reversal of 686504141 is 141405686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444577225 + 241926916 = 21085^2 + 15554^2 .

It is a cyclic number.

It is not a de Polignac number, because 686504141 - 2¹⁴ = 686487757 is a prime.

It is a super-2 number, since 2×686504141² = 942575871220295762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686504111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343252070 + 343252071.

It is an arithmetic number, because the mean of its divisors is an integer number (343252071).

Almost surely, 2^686504141 is an apocalyptic number.

It is an amenable number.

686504141 is a deficient number, since it is larger than the sum of its proper divisors (1).

686504141 is an equidigital number, since it uses as much as digits as its factorization.

686504141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 686504141 is about 26201.2240362927. The cubic root of 686504141 is about 882.1607289142.

The spelling of 686504141 in words is "six hundred eighty-six million, five hundred four thousand, one hundred forty-one".