689106491 has 2 divisors, whose sum is σ = 689106492. Its totient is φ = 689106490.

The previous prime is 689106487. The next prime is 689106511. The reversal of 689106491 is 194601986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689106491 - 2² = 689106487 is a prime.

It is not a weakly prime, because it can be changed into another prime (689106401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344553245 + 344553246.

It is an arithmetic number, because the mean of its divisors is an integer number (344553246).

Almost surely, 2^689106491 is an apocalyptic number.

689106491 is a deficient number, since it is larger than the sum of its proper divisors (1).

689106491 is an equidigital number, since it uses as much as digits as its factorization.

689106491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 689106491 is about 26250.8379104363. The cubic root of 689106491 is about 883.2740003184.

The spelling of 689106491 in words is "six hundred eighty-nine million, one hundred six thousand, four hundred ninety-one".