1690001 has 4 divisors (see below), whose sum is σ = 1692900. Its totient is φ = 1687104.

The previous prime is 1689967. The next prime is 1690009. The reversal of 1690001 is 1000961.

It is a Cunningham number, because it is equal to 1300²+1.

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 1488400 + 201601 = 1220^2 + 449^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690001 - 2¹⁰ = 1688977 is a prime.

It is a super-2 number, since 2×1690001² = 5712206760002, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690009) 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, 236 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (423225).

2^1690001 is an apocalyptic number.

It is an amenable number.

1690001 is a deficient number, since it is larger than the sum of its proper divisors (2899).

1690001 is an equidigital number, since it uses as much as digits as its factorization.

1690001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1690001 is about 1300.0003846153. Note that the first 3 decimals coincide. The cubic root of 1690001 is about 119.1138660135.

Adding to 1690001 its reverse (1000961), we get a palindrome (2690962).

The spelling of 1690001 in words is "one million, six hundred ninety thousand, one".