689685547 has 2 divisors, whose sum is σ = 689685548. Its totient is φ = 689685546.

The previous prime is 689685539. The next prime is 689685553. The reversal of 689685547 is 745586986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689685547 - 2³ = 689685539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689685491 and 689685500.

It is not a weakly prime, because it can be changed into another prime (689685517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344842773 + 344842774.

It is an arithmetic number, because the mean of its divisors is an integer number (344842774).

Almost surely, 2^689685547 is an apocalyptic number.

689685547 is a deficient number, since it is larger than the sum of its proper divisors (1).

689685547 is an equidigital number, since it uses as much as digits as its factorization.

689685547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 58.

The square root of 689685547 is about 26261.8648804688. The cubic root of 689685547 is about 883.5213360213.

The spelling of 689685547 in words is "six hundred eighty-nine million, six hundred eighty-five thousand, five hundred forty-seven".