686554997 has 2 divisors, whose sum is σ = 686554998. Its totient is φ = 686554996.

The previous prime is 686554993. The next prime is 686555119. The reversal of 686554997 is 799455686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603635761 + 82919236 = 24569^2 + 9106^2 .

It is a cyclic number.

It is not a de Polignac number, because 686554997 - 2² = 686554993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686554993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343277498 + 343277499.

It is an arithmetic number, because the mean of its divisors is an integer number (343277499).

Almost surely, 2^686554997 is an apocalyptic number.

It is an amenable number.

686554997 is a deficient number, since it is larger than the sum of its proper divisors (1).

686554997 is an equidigital number, since it uses as much as digits as its factorization.

686554997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 59.

The square root of 686554997 is about 26202.1945073309. The cubic root of 686554997 is about 882.1825117682.

The spelling of 686554997 in words is "six hundred eighty-six million, five hundred fifty-four thousand, nine hundred ninety-seven".