1098997 has 4 divisors (see below), whose sum is σ = 1109376. Its totient is φ = 1088620.

The previous prime is 1098989. The next prime is 1099031. The reversal of 1098997 is 7998901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7998901 = 751 ⋅10651.

It is a cyclic number.

It is not a de Polignac number, because 1098997 - 2³ = 1098989 is a prime.

1098997 is a lucky number.

It is a congruent 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, 5029 + ... + 5242.

It is an arithmetic number, because the mean of its divisors is an integer number (277344).

2^1098997 is an apocalyptic number.

It is an amenable number.

1098997 is a deficient number, since it is larger than the sum of its proper divisors (10379).

1098997 is a wasteful number, since it uses less digits than its factorization.

1098997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10378.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1098997 is about 1048.3305776328. The cubic root of 1098997 is about 103.1966269454.

The spelling of 1098997 in words is "one million, ninety-eight thousand, nine hundred ninety-seven".