1181493281 has 2 divisors, whose sum is σ = 1181493282. Its totient is φ = 1181493280.

The previous prime is 1181493277. The next prime is 1181493301. The reversal of 1181493281 is 1823941811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831803281 + 349690000 = 28841^2 + 18700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181493281 - 2² = 1181493277 is a prime.

It is a super-2 number, since 2×1181493281² = 2791852746096289922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1181493881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590746640 + 590746641.

It is an arithmetic number, because the mean of its divisors is an integer number (590746641).

Almost surely, 2^1181493281 is an apocalyptic number.

It is an amenable number.

1181493281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181493281 is an equidigital number, since it uses as much as digits as its factorization.

1181493281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 38.

The square root of 1181493281 is about 34372.8567477305. The cubic root of 1181493281 is about 1057.1673751514.

The spelling of 1181493281 in words is "one billion, one hundred eighty-one million, four hundred ninety-three thousand, two hundred eighty-one".