686453681 has 2 divisors, whose sum is σ = 686453682. Its totient is φ = 686453680.

The previous prime is 686453639. The next prime is 686453689. The reversal of 686453681 is 186354686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676468081 + 9985600 = 26009^2 + 3160^2 .

It is a cyclic number.

It is not a de Polignac number, because 686453681 - 2⁶ = 686453617 is a prime.

It is a super-2 number, since 2×686453681² = 942437312316899522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (686453689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343226840 + 343226841.

It is an arithmetic number, because the mean of its divisors is an integer number (343226841).

Almost surely, 2^686453681 is an apocalyptic number.

It is an amenable number.

686453681 is a deficient number, since it is larger than the sum of its proper divisors (1).

686453681 is an equidigital number, since it uses as much as digits as its factorization.

686453681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 47.

The square root of 686453681 is about 26200.2610864854. The cubic root of 686453681 is about 882.1391146134.

The spelling of 686453681 in words is "six hundred eighty-six million, four hundred fifty-three thousand, six hundred eighty-one".