1098621 has 6 divisors (see below), whose sum is σ = 1586910. Its totient is φ = 732408.

The previous prime is 1098613. The next prime is 1098623. The reversal of 1098621 is 1268901.

It can be written as a sum of positive squares in only one way, i.e., 622521 + 476100 = 789^2 + 690^2 .

It is not a de Polignac number, because 1098621 - 2³ = 1098613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61026 + ... + 61043.

It is an arithmetic number, because the mean of its divisors is an integer number (264485).

2^1098621 is an apocalyptic number.

It is an amenable number.

1098621 is a deficient number, since it is larger than the sum of its proper divisors (488289).

1098621 is a wasteful number, since it uses less digits than its factorization.

1098621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122075 (or 122072 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1098621 is about 1048.1512295466. The cubic root of 1098621 is about 103.1848567108.

The spelling of 1098621 in words is "one million, ninety-eight thousand, six hundred twenty-one".