1098561 has 8 divisors (see below), whose sum is σ = 1541920. Its totient is φ = 693792.

The previous prime is 1098541. The next prime is 1098593. The reversal of 1098561 is 1658901.

It is a happy number.

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

It is not a de Polignac number, because 1098561 - 2¹⁴ = 1082177 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1098511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9580 + ... + 9693.

It is an arithmetic number, because the mean of its divisors is an integer number (192740).

2^1098561 is an apocalyptic number.

It is an amenable number.

1098561 is a deficient number, since it is larger than the sum of its proper divisors (443359).

1098561 is a wasteful number, since it uses less digits than its factorization.

1098561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19295.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1098561 is about 1048.1226073318. The cubic root of 1098561 is about 103.1829782334.

The spelling of 1098561 in words is "one million, ninety-eight thousand, five hundred sixty-one".