686786101 has 2 divisors, whose sum is σ = 686786102. Its totient is φ = 686786100.

The previous prime is 686786083. The next prime is 686786131. The reversal of 686786101 is 101687686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 472192900 + 214593201 = 21730^2 + 14649^2 .

It is a cyclic number.

It is not a de Polignac number, because 686786101 - 2¹³ = 686777909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686786131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343393050 + 343393051.

It is an arithmetic number, because the mean of its divisors is an integer number (343393051).

Almost surely, 2^686786101 is an apocalyptic number.

It is an amenable number.

686786101 is a deficient number, since it is larger than the sum of its proper divisors (1).

686786101 is an equidigital number, since it uses as much as digits as its factorization.

686786101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 686786101 is about 26206.6041485729. The cubic root of 686786101 is about 882.2814856482.

The spelling of 686786101 in words is "six hundred eighty-six million, seven hundred eighty-six thousand, one hundred one".