1156981 has 8 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 985488.

The previous prime is 1156963. The next prime is 1156997. The reversal of 1156981 is 1896511.

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

It is not a de Polignac number, because 1156981 - 2⁵ = 1156949 is a prime.

It is a super-2 number, since 2×1156981² = 2677210068722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156681) 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, 960 + ... + 1798.

It is an arithmetic number, because the mean of its divisors is an integer number (166320).

2^1156981 is an apocalyptic number.

It is an amenable number.

1156981 is a deficient number, since it is larger than the sum of its proper divisors (173579).

1156981 is an equidigital number, since it uses as much as digits as its factorization.

1156981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

The product of its digits is 2160, while the sum is 31.

The square root of 1156981 is about 1075.6305127691. The cubic root of 1156981 is about 104.9805254888.

The spelling of 1156981 in words is "one million, one hundred fifty-six thousand, nine hundred eighty-one".