1163981 has 8 divisors (see below), whose sum is σ = 1432704. Its totient is φ = 920880.

The previous prime is 1163977. The next prime is 1163989. The reversal of 1163981 is 1893611.

It is a happy number.

1163981 is nontrivially palindromic in base 9.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1163981 - 2² = 1163977 is a prime.

It is a super-2 number, since 2×1163981² = 2709703536722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6305 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (179088).

2^1163981 is an apocalyptic number.

It is an amenable number.

1163981 is a deficient number, since it is larger than the sum of its proper divisors (268723).

1163981 is a wasteful number, since it uses less digits than its factorization.

1163981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12811.

The product of its digits is 1296, while the sum is 29.

The square root of 1163981 is about 1078.8795113450. The cubic root of 1163981 is about 105.1918186759.

The spelling of 1163981 in words is "one million, one hundred sixty-three thousand, nine hundred eighty-one".