1696561 has 4 divisors (see below), whose sum is σ = 1742452. Its totient is φ = 1650672.

The previous prime is 1696547. The next prime is 1696571. The reversal of 1696561 is 1656961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1656961 = 103 ⋅16087.

It can be written as a sum of positive squares in 2 ways, for example, as 1577536 + 119025 = 1256^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1696561 - 2¹¹ = 1694513 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1696501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22890 + ... + 22963.

It is an arithmetic number, because the mean of its divisors is an integer number (435613).

2^1696561 is an apocalyptic number.

It is an amenable number.

1696561 is a deficient number, since it is larger than the sum of its proper divisors (45891).

1696561 is an equidigital number, since it uses as much as digits as its factorization.

1696561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45890.

The product of its digits is 9720, while the sum is 34.

The square root of 1696561 is about 1302.5210171049. The cubic root of 1696561 is about 119.2677866544.

It can be divided in two parts, 169 and 6561, that multiplied together give a square (1108809 = 1053²).

The spelling of 1696561 in words is "one million, six hundred ninety-six thousand, five hundred sixty-one".