686353901 has 2 divisors, whose sum is σ = 686353902. Its totient is φ = 686353900.

The previous prime is 686353873. The next prime is 686353909. The reversal of 686353901 is 109353686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431185225 + 255168676 = 20765^2 + 15974^2 .

It is a cyclic number.

It is not a de Polignac number, because 686353901 - 2¹⁴ = 686337517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686353909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343176950 + 343176951.

It is an arithmetic number, because the mean of its divisors is an integer number (343176951).

Almost surely, 2^686353901 is an apocalyptic number.

It is an amenable number.

686353901 is a deficient number, since it is larger than the sum of its proper divisors (1).

686353901 is an equidigital number, since it uses as much as digits as its factorization.

686353901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 686353901 is about 26198.3568377866. The cubic root of 686353901 is about 882.0963712070.

The spelling of 686353901 in words is "six hundred eighty-six million, three hundred fifty-three thousand, nine hundred one".