1098981 has 32 divisors (see below), whose sum is σ = 1827840. Its totient is φ = 648000.

The previous prime is 1098973. The next prime is 1098989. The reversal of 1098981 is 1898901.

It is an interprime number because it is at equal distance from previous prime (1098973) and next prime (1098989).

It is not a de Polignac number, because 1098981 - 2³ = 1098973 is a prime.

It is a super-2 number, since 2×1098981² = 2415518476722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10831 + ... + 10931.

It is an arithmetic number, because the mean of its divisors is an integer number (57120).

2^1098981 is an apocalyptic number.

It is an amenable number.

1098981 is a deficient number, since it is larger than the sum of its proper divisors (728859).

1098981 is a wasteful number, since it uses less digits than its factorization.

1098981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1098981 is about 1048.3229464244. The cubic root of 1098981 is about 103.1961261391.

The spelling of 1098981 in words is "one million, ninety-eight thousand, nine hundred eighty-one".