690091 has 8 divisors (see below), whose sum is σ = 722304. Its totient is φ = 658560.

The previous prime is 690089. The next prime is 690103. The reversal of 690091 is 190096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 690091 - 2¹ = 690089 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (690491) 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 7 ways as a sum of consecutive naturals, for example, 3405 + ... + 3601.

It is an arithmetic number, because the mean of its divisors is an integer number (90288).

2⁶⁹⁰⁰⁹¹ is an apocalyptic number.

690091 is a deficient number, since it is larger than the sum of its proper divisors (32213).

690091 is a wasteful number, since it uses less digits than its factorization.

690091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 690091 is about 830.7171600491. The cubic root of 690091 is about 88.3694437228.

The spelling of 690091 in words is "six hundred ninety thousand, ninety-one".