1155982409 has 2 divisors, whose sum is σ = 1155982410. Its totient is φ = 1155982408.

The previous prime is 1155982361. The next prime is 1155982411. The reversal of 1155982409 is 9042895511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1024192009 + 131790400 = 32003^2 + 11480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155982409 - 2²⁸ = 887546953 is a prime.

Together with 1155982411, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1155982409.

It is not a weakly prime, because it can be changed into another prime (1155982469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577991204 + 577991205.

It is an arithmetic number, because the mean of its divisors is an integer number (577991205).

Almost surely, 2^1155982409 is an apocalyptic number.

It is an amenable number.

1155982409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155982409 is an equidigital number, since it uses as much as digits as its factorization.

1155982409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 44.

The square root of 1155982409 is about 33999.7413078394. The cubic root of 1155982409 is about 1049.5031387691.

The spelling of 1155982409 in words is "one billion, one hundred fifty-five million, nine hundred eighty-two thousand, four hundred nine".