1155686489 has 2 divisors, whose sum is σ = 1155686490. Its totient is φ = 1155686488.

The previous prime is 1155686473. The next prime is 1155686491. The reversal of 1155686489 is 9846865511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1075315264 + 80371225 = 32792^2 + 8965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155686489 - 2⁴ = 1155686473 is a prime.

It is a super-2 number, since 2×1155686489² = 2671222521714294242, which contains 22 as substring.

Together with 1155686491, 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 1155686489.

It is not a weakly prime, because it can be changed into another prime (1155686089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577843244 + 577843245.

It is an arithmetic number, because the mean of its divisors is an integer number (577843245).

Almost surely, 2^1155686489 is an apocalyptic number.

It is an amenable number.

1155686489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155686489 is an equidigital number, since it uses as much as digits as its factorization.

1155686489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 53.

The square root of 1155686489 is about 33995.3892314826. The cubic root of 1155686489 is about 1049.4135770044.

The spelling of 1155686489 in words is "one billion, one hundred fifty-five million, six hundred eighty-six thousand, four hundred eighty-nine".