686826761 has 2 divisors, whose sum is σ = 686826762. Its totient is φ = 686826760.

The previous prime is 686826727. The next prime is 686826773. The reversal of 686826761 is 167628686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536617225 + 150209536 = 23165^2 + 12256^2 .

It is a cyclic number.

It is not a de Polignac number, because 686826761 - 2²⁶ = 619717897 is a prime.

It is a super-2 number, since 2×686826761² = 943461999251502242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (686826461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343413380 + 343413381.

It is an arithmetic number, because the mean of its divisors is an integer number (343413381).

Almost surely, 2^686826761 is an apocalyptic number.

It is an amenable number.

686826761 is a deficient number, since it is larger than the sum of its proper divisors (1).

686826761 is an equidigital number, since it uses as much as digits as its factorization.

686826761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The square root of 686826761 is about 26207.3798957469. The cubic root of 686826761 is about 882.2988966282.

The spelling of 686826761 in words is "six hundred eighty-six million, eight hundred twenty-six thousand, seven hundred sixty-one".