689226091 has 2 divisors, whose sum is σ = 689226092. Its totient is φ = 689226090.

The previous prime is 689226077. The next prime is 689226101. The reversal of 689226091 is 190622986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689226091 - 2⁷ = 689225963 is a prime.

It is not a weakly prime, because it can be changed into another prime (689226011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344613045 + 344613046.

It is an arithmetic number, because the mean of its divisors is an integer number (344613046).

Almost surely, 2^689226091 is an apocalyptic number.

689226091 is a deficient number, since it is larger than the sum of its proper divisors (1).

689226091 is an equidigital number, since it uses as much as digits as its factorization.

689226091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 689226091 is about 26253.1158341253. The cubic root of 689226091 is about 883.3250971425.

The spelling of 689226091 in words is "six hundred eighty-nine million, two hundred twenty-six thousand, ninety-one".