690001 has 4 divisors (see below), whose sum is σ = 743092. Its totient is φ = 636912.

The previous prime is 689987. The next prime is 690037. The reversal of 690001 is 100096.

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 48400 + 641601 = 220^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 690001 - 2⁷ = 689873 is a prime.

It is a super-2 number, since 2×690001² = 952202760002, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691001) 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, 26526 + ... + 26551.

It is an arithmetic number, because the mean of its divisors is an integer number (185773).

2⁶⁹⁰⁰⁰¹ is an apocalyptic number.

It is an amenable number.

690001 is a deficient number, since it is larger than the sum of its proper divisors (53091).

690001 is a wasteful number, since it uses less digits than its factorization.

690001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53090.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 690001 is about 830.6629882209. The cubic root of 690001 is about 88.3656019127.

Adding to 690001 its reverse (100096), we get a palindrome (790097).

The spelling of 690001 in words is "six hundred ninety thousand, one".