1161863489 has 2 divisors, whose sum is σ = 1161863490. Its totient is φ = 1161863488.

The previous prime is 1161863473. The next prime is 1161863491. The reversal of 1161863489 is 9843681611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 904806400 + 257057089 = 30080^2 + 16033^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161863489 - 2⁴ = 1161863473 is a prime.

Together with 1161863491, 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 (1161863089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580931744 + 580931745.

It is an arithmetic number, because the mean of its divisors is an integer number (580931745).

Almost surely, 2^1161863489 is an apocalyptic number.

It is an amenable number.

1161863489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161863489 is an equidigital number, since it uses as much as digits as its factorization.

1161863489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 1161863489 is about 34086.1187142215. The cubic root of 1161863489 is about 1051.2799173423.

The spelling of 1161863489 in words is "one billion, one hundred sixty-one million, eight hundred sixty-three thousand, four hundred eighty-nine".