689458057 has 2 divisors, whose sum is σ = 689458058. Its totient is φ = 689458056.

The previous prime is 689458019. The next prime is 689458061. The reversal of 689458057 is 750854986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597509136 + 91948921 = 24444^2 + 9589^2 .

It is a cyclic number.

It is not a de Polignac number, because 689458057 - 2²³ = 681069449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689457995 and 689458013.

It is not a weakly prime, because it can be changed into another prime (689458157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344729028 + 344729029.

It is an arithmetic number, because the mean of its divisors is an integer number (344729029).

Almost surely, 2^689458057 is an apocalyptic number.

It is an amenable number.

689458057 is a deficient number, since it is larger than the sum of its proper divisors (1).

689458057 is an equidigital number, since it uses as much as digits as its factorization.

689458057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The square root of 689458057 is about 26257.5333380727. The cubic root of 689458057 is about 883.4241833539.

The spelling of 689458057 in words is "six hundred eighty-nine million, four hundred fifty-eight thousand, fifty-seven".