689414779 has 2 divisors, whose sum is σ = 689414780. Its totient is φ = 689414778.

The previous prime is 689414773. The next prime is 689414807. The reversal of 689414779 is 977414986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689414779 - 2³ = 689414771 is a prime.

It is not a weakly prime, because it can be changed into another prime (689414771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344707389 + 344707390.

It is an arithmetic number, because the mean of its divisors is an integer number (344707390).

Almost surely, 2^689414779 is an apocalyptic number.

689414779 is a deficient number, since it is larger than the sum of its proper divisors (1).

689414779 is an equidigital number, since it uses as much as digits as its factorization.

689414779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 689414779 is about 26256.7092187883. The cubic root of 689414779 is about 883.4056984819.

The spelling of 689414779 in words is "six hundred eighty-nine million, four hundred fourteen thousand, seven hundred seventy-nine".