1291180489 has 3 divisors (see below), whose sum is σ = 1291216423. Its totient is φ = 1291144556.

The previous prime is 1291180459. The next prime is 1291180523. The reversal of 1291180489 is 9840811921.

It is a happy number.

The square root of 1291180489 is 35933.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9840811921 = 283 ⋅34773187.

It can be written as a sum of positive squares in only one way, i.e., 918999225 + 372181264 = 30315^2 + 19292^2 .

It is not a de Polignac number, because 1291180489 - 2¹⁵ = 1291147721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291180439) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17967 + ... + 53899.

Almost surely, 2^1291180489 is an apocalyptic number.

1291180489 is the 35933-rd square number.

1291180489 is the 17967-th centered octagonal number.

It is an amenable number.

1291180489 is a deficient number, since it is larger than the sum of its proper divisors (35934).

1291180489 is an frugal number, since it uses more digits than its factorization.

1291180489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71866 (or 35933 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The cubic root of 1291180489 is about 1088.9191904200.

The spelling of 1291180489 in words is "one billion, two hundred ninety-one million, one hundred eighty thousand, four hundred eighty-nine".