690911 has 4 divisors (see below), whose sum is σ = 744072. Its totient is φ = 637752.

The previous prime is 690889. The next prime is 690919. The reversal of 690911 is 119096.

690911 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690911.

It is not an unprimeable number, because it can be changed into a prime (690919) 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, 26561 + ... + 26586.

It is an arithmetic number, because the mean of its divisors is an integer number (186018).

2⁶⁹⁰⁹¹¹ is an apocalyptic number.

690911 is a deficient number, since it is larger than the sum of its proper divisors (53161).

690911 is a wasteful number, since it uses less digits than its factorization.

690911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53160.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 690911 is about 831.2105629743. The cubic root of 690911 is about 88.4044315053.

The spelling of 690911 in words is "six hundred ninety thousand, nine hundred eleven".