690601 has 4 divisors (see below), whose sum is σ = 693252. Its totient is φ = 687952.

The previous prime is 690589. The next prime is 690607. The reversal of 690601 is 106096.

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 416025 + 274576 = 645^2 + 524^2 .

It is a cyclic number.

It is not a de Polignac number, because 690601 - 2⁹ = 690089 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690607) 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, 886 + ... + 1471.

It is an arithmetic number, because the mean of its divisors is an integer number (173313).

2⁶⁹⁰⁶⁰¹ is an apocalyptic number.

It is an amenable number.

690601 is a deficient number, since it is larger than the sum of its proper divisors (2651).

690601 is a wasteful number, since it uses less digits than its factorization.

690601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 690601 is about 831.0240670402. The cubic root of 690601 is about 88.3912076730.

Adding to 690601 its reverse (106096), we get a palindrome (796697).

The spelling of 690601 in words is "six hundred ninety thousand, six hundred one".