691098 has 8 divisors (see below), whose sum is σ = 1382208. Its totient is φ = 230364.

The previous prime is 691079. The next prime is 691109. The reversal of 691098 is 890196.

It is a happy number.

691098 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

691098 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691098.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57586 + ... + 57597.

It is an arithmetic number, because the mean of its divisors is an integer number (172776).

2⁶⁹¹⁰⁹⁸ is an apocalyptic number.

691098 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691098 is a wasteful number, since it uses less digits than its factorization.

691098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115188.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 691098 is about 831.3230419037. The cubic root of 691098 is about 88.4124065496.

The spelling of 691098 in words is "six hundred ninety-one thousand, ninety-eight".