1147981 has 2 divisors, whose sum is σ = 1147982. Its totient is φ = 1147980.

The previous prime is 1147969. The next prime is 1147987. The reversal of 1147981 is 1897411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 872356 + 275625 = 934^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1147981 - 2¹⁷ = 1016909 is a prime.

It is a super-2 number, since 2×1147981² = 2635720752722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1147987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 573990 + 573991.

It is an arithmetic number, because the mean of its divisors is an integer number (573991).

2^1147981 is an apocalyptic number.

It is an amenable number.

1147981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1147981 is an equidigital number, since it uses as much as digits as its factorization.

1147981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 1147981 is about 1071.4387523326. The cubic root of 1147981 is about 104.7076067862.

The spelling of 1147981 in words is "one million, one hundred forty-seven thousand, nine hundred eighty-one".