686992487 has 2 divisors, whose sum is σ = 686992488. Its totient is φ = 686992486.

The previous prime is 686992483. The next prime is 686992507. The reversal of 686992487 is 784299686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686992487 - 2² = 686992483 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686992483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343496243 + 343496244.

It is an arithmetic number, because the mean of its divisors is an integer number (343496244).

Almost surely, 2^686992487 is an apocalyptic number.

686992487 is a deficient number, since it is larger than the sum of its proper divisors (1).

686992487 is an equidigital number, since it uses as much as digits as its factorization.

686992487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 59.

The square root of 686992487 is about 26210.5415243562. The cubic root of 686992487 is about 882.3698548942.

The spelling of 686992487 in words is "six hundred eighty-six million, nine hundred ninety-two thousand, four hundred eighty-seven".