1098521 has 8 divisors (see below), whose sum is σ = 1145760. Its totient is φ = 1052352.

The previous prime is 1098511. The next prime is 1098533. The reversal of 1098521 is 1258901.

It is a happy number.

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 1098521 - 2¹⁸ = 836377 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2321 + ... + 2753.

It is an arithmetic number, because the mean of its divisors is an integer number (143220).

2^1098521 is an apocalyptic number.

It is an amenable number.

1098521 is a deficient number, since it is larger than the sum of its proper divisors (47239).

1098521 is an equidigital number, since it uses as much as digits as its factorization.

1098521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1098521 is about 1048.1035254210. The cubic root of 1098521 is about 103.1817258771.

The spelling of 1098521 in words is "one million, ninety-eight thousand, five hundred twenty-one".