1098261 has 6 divisors (see below), whose sum is σ = 1586390. Its totient is φ = 732168.

The previous prime is 1098233. The next prime is 1098269. The reversal of 1098261 is 1628901.

It can be written as a sum of positive squares in only one way, i.e., 731025 + 367236 = 855^2 + 606^2 .

It is not a de Polignac number, because 1098261 - 2⁷ = 1098133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098269) 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 5 ways as a sum of consecutive naturals, for example, 61006 + ... + 61023.

2^1098261 is an apocalyptic number.

It is an amenable number.

1098261 is a deficient number, since it is larger than the sum of its proper divisors (488129).

1098261 is a wasteful number, since it uses less digits than its factorization.

1098261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122035 (or 122032 counting only the distinct ones).

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

The square root of 1098261 is about 1047.9794845320. The cubic root of 1098261 is about 103.1735848204.

The spelling of 1098261 in words is "one million, ninety-eight thousand, two hundred sixty-one".