1689497 has 2 divisors, whose sum is σ = 1689498. Its totient is φ = 1689496.

The previous prime is 1689451. The next prime is 1689503. The reversal of 1689497 is 7949861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1430416 + 259081 = 1196^2 + 509^2 .

It is an emirp because it is prime and its reverse (7949861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1689497 is a prime.

It is a super-2 number, since 2×1689497² = 5708800226018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1689437) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844748 + 844749.

It is an arithmetic number, because the mean of its divisors is an integer number (844749).

2^1689497 is an apocalyptic number.

It is an amenable number.

1689497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689497 is an equidigital number, since it uses as much as digits as its factorization.

1689497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 1689497 is about 1299.8065240643. The cubic root of 1689497 is about 119.1020239382.

The spelling of 1689497 in words is "one million, six hundred eighty-nine thousand, four hundred ninety-seven".