689770691 has 2 divisors, whose sum is σ = 689770692. Its totient is φ = 689770690.

The previous prime is 689770657. The next prime is 689770703. The reversal of 689770691 is 196077986.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689770691 - 2¹⁰ = 689769667 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689770651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344885345 + 344885346.

It is an arithmetic number, because the mean of its divisors is an integer number (344885346).

Almost surely, 2^689770691 is an apocalyptic number.

689770691 is a deficient number, since it is larger than the sum of its proper divisors (1).

689770691 is an equidigital number, since it uses as much as digits as its factorization.

689770691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 689770691 is about 26263.4858882061. The cubic root of 689770691 is about 883.5576924185.

The spelling of 689770691 in words is "six hundred eighty-nine million, seven hundred seventy thousand, six hundred ninety-one".