2091098 has 4 divisors (see below), whose sum is σ = 3136650. Its totient is φ = 1045548.

The previous prime is 2091097. The next prime is 2091139. The reversal of 2091098 is 8901902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8901902 = 2 ⋅4450951.

It can be written as a sum of positive squares in only one way, i.e., 1605289 + 485809 = 1267^2 + 697^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2091098.

It is not an unprimeable number, because it can be changed into a prime (2091097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 522773 + ... + 522776.

2^2091098 is an apocalyptic number.

2091098 is a deficient number, since it is larger than the sum of its proper divisors (1045552).

2091098 is a wasteful number, since it uses less digits than its factorization.

2091098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045551.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 2091098 is about 1446.0629308574. The cubic root of 2091098 is about 127.8767123440.

Subtracting from 2091098 its product of nonzero digits (1296), we obtain a palindrome (2089802).

The spelling of 2091098 in words is "two million, ninety-one thousand, ninety-eight".