1136981 has 2 divisors, whose sum is σ = 1136982. Its totient is φ = 1136980.

The previous prime is 1136969. The next prime is 1136983. The reversal of 1136981 is 1896311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1136356 + 625 = 1066^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 1136981 - 2⁶ = 1136917 is a prime.

It is a super-2 number, since 2×1136981² = 2585451588722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1136983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1136983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 568490 + 568491.

It is an arithmetic number, because the mean of its divisors is an integer number (568491).

2^1136981 is an apocalyptic number.

It is an amenable number.

1136981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1136981 is an equidigital number, since it uses as much as digits as its factorization.

1136981 is an evil number, because the sum of its binary digits is even.

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

The square root of 1136981 is about 1066.2931116724. The cubic root of 1136981 is about 104.3720953690.

The spelling of 1136981 in words is "one million, one hundred thirty-six thousand, nine hundred eighty-one".