1098551 has 4 divisors (see below), whose sum is σ = 1102992. Its totient is φ = 1094112.

The previous prime is 1098541. The next prime is 1098593. The reversal of 1098551 is 1558901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098551 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 (1098511) 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, 1826 + ... + 2351.

It is an arithmetic number, because the mean of its divisors is an integer number (275748).

2^1098551 is an apocalyptic number.

1098551 is a deficient number, since it is larger than the sum of its proper divisors (4441).

1098551 is an equidigital number, since it uses as much as digits as its factorization.

1098551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1098551 is about 1048.1178368867. The cubic root of 1098551 is about 103.1826651472.

The spelling of 1098551 in words is "one million, ninety-eight thousand, five hundred fifty-one".