1191280481 has 2 divisors, whose sum is σ = 1191280482. Its totient is φ = 1191280480.

The previous prime is 1191280463. The next prime is 1191280483. The reversal of 1191280481 is 1840821911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655820881 + 535459600 = 25609^2 + 23140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191280481 - 2¹⁴ = 1191264097 is a prime.

It is a super-2 number, since 2×1191280481² = 2838298368823182722, which contains 22 as substring.

Together with 1191280483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1191280483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595640240 + 595640241.

It is an arithmetic number, because the mean of its divisors is an integer number (595640241).

Almost surely, 2^1191280481 is an apocalyptic number.

It is an amenable number.

1191280481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191280481 is an equidigital number, since it uses as much as digits as its factorization.

1191280481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1191280481 is about 34514.9312761883. The cubic root of 1191280481 is about 1060.0784565757.

The spelling of 1191280481 in words is "one billion, one hundred ninety-one million, two hundred eighty thousand, four hundred eighty-one".