689673091 has 2 divisors, whose sum is σ = 689673092. Its totient is φ = 689673090.

The previous prime is 689673071. The next prime is 689673097. The reversal of 689673091 is 190376986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689673091 - 2⁵ = 689673059 is a prime.

It is not a weakly prime, because it can be changed into another prime (689673097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344836545 + 344836546.

It is an arithmetic number, because the mean of its divisors is an integer number (344836546).

Almost surely, 2^689673091 is an apocalyptic number.

689673091 is a deficient number, since it is larger than the sum of its proper divisors (1).

689673091 is an equidigital number, since it uses as much as digits as its factorization.

689673091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 689673091 is about 26261.6277294459. The cubic root of 689673091 is about 883.5160170717.

The spelling of 689673091 in words is "six hundred eighty-nine million, six hundred seventy-three thousand, ninety-one".