1179981 has 32 divisors (see below), whose sum is σ = 1987200. Its totient is φ = 685440.

The previous prime is 1179979. The next prime is 1179989. The reversal of 1179981 is 1899711.

It is not a de Polignac number, because 1179981 - 2¹ = 1179979 is a prime.

It is a super-2 number, since 2×1179981² = 2784710320722, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

1179981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1179989) 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 31 ways as a sum of consecutive naturals, for example, 8545 + ... + 8681.

It is an arithmetic number, because the mean of its divisors is an integer number (62100).

2^1179981 is an apocalyptic number.

1179981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1179981 is a deficient number, since it is larger than the sum of its proper divisors (807219).

1179981 is a wasteful number, since it uses less digits than its factorization.

1179981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 180 counting only the distinct ones).

The product of its digits is 4536, while the sum is 36.

The square root of 1179981 is about 1086.2693036259. The cubic root of 1179981 is about 105.6716133558.

The spelling of 1179981 in words is "one million, one hundred seventy-nine thousand, nine hundred eighty-one".