1690061 has 4 divisors (see below), whose sum is σ = 1731324. Its totient is φ = 1648800.

The previous prime is 1690057. The next prime is 1690067. The reversal of 1690061 is 1600961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164836 + 1525225 = 406^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690061 - 2² = 1690057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20570 + ... + 20651.

It is an arithmetic number, because the mean of its divisors is an integer number (432831).

2^1690061 is an apocalyptic number.

It is an amenable number.

1690061 is a deficient number, since it is larger than the sum of its proper divisors (41263).

1690061 is an equidigital number, since it uses as much as digits as its factorization.

1690061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41262.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1690061 is about 1300.0234613268. The cubic root of 1690061 is about 119.1152756275.

It can be divided in two parts, 16900 and 61, that added together give a palindrome (16961).

The spelling of 1690061 in words is "one million, six hundred ninety thousand, sixty-one".