661098 has 8 divisors (see below), whose sum is σ = 1322208. Its totient is φ = 220364.

The previous prime is 661097. The next prime is 661099. The reversal of 661098 is 890166.

It is an interprime number because it is at equal distance from previous prime (661097) and next prime (661099).

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

661098 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 661098.

It is not an unprimeable number, because it can be changed into a prime (661091) 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, 55086 + ... + 55097.

It is an arithmetic number, because the mean of its divisors is an integer number (165276).

2⁶⁶¹⁰⁹⁸ is an apocalyptic number.

661098 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.

661098 is a wasteful number, since it uses less digits than its factorization.

661098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110188.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 661098 is about 813.0793319228. The cubic root of 661098 is about 87.1141321482.

The spelling of 661098 in words is "six hundred sixty-one thousand, ninety-eight".