1269409489 has 4 divisors (see below), whose sum is σ = 1313182260. Its totient is φ = 1225636720.

The previous prime is 1269409481. The next prime is 1269409571. The reversal of 1269409489 is 9849049621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9849049621 = 401 ⋅24561221.

It can be written as a sum of positive squares in 2 ways, for example, as 930555025 + 338854464 = 30505^2 + 18408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1269409489 - 2³ = 1269409481 is a prime.

It is a super-3 number, since 3×1269409489³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1269409481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21886342 + ... + 21886399.

It is an arithmetic number, because the mean of its divisors is an integer number (328295565).

Almost surely, 2^1269409489 is an apocalyptic number.

It is an amenable number.

1269409489 is a deficient number, since it is larger than the sum of its proper divisors (43772771).

1269409489 is an equidigital number, since it uses as much as digits as its factorization.

1269409489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43772770.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 1269409489 is about 35628.7733299927. The cubic root of 1269409489 is about 1082.7642634158.

The spelling of 1269409489 in words is "one billion, two hundred sixty-nine million, four hundred nine thousand, four hundred eighty-nine".