1098961 has 4 divisors (see below), whose sum is σ = 1101492. Its totient is φ = 1096432.

The previous prime is 1098953. The next prime is 1098967. The reversal of 1098961 is 1698901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1698901 = 151 ⋅11251.

It can be written as a sum of positive squares in 2 ways, for example, as 160000 + 938961 = 400^2 + 969^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098961 - 2³ = 1098953 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 (1098967) 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, 430 + ... + 1543.

It is an arithmetic number, because the mean of its divisors is an integer number (275373).

2^1098961 is an apocalyptic number.

It is an amenable number.

1098961 is a deficient number, since it is larger than the sum of its proper divisors (2531).

1098961 is an equidigital number, since it uses as much as digits as its factorization.

1098961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1098961 is about 1048.3134073358. The cubic root of 1098961 is about 103.1955001243.

The spelling of 1098961 in words is "one million, ninety-eight thousand, nine hundred sixty-one".