11539397489 has 4 divisors (see below), whose sum is σ = 11540395380. Its totient is φ = 11538399600.

The previous prime is 11539397447. The next prime is 11539397497. The reversal of 11539397489 is 98479393511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98479393511 = 83 ⋅1186498717.

It can be written as a sum of positive squares in 2 ways, for example, as 3545607025 + 7993790464 = 59545^2 + 89408^2 .

It is a cyclic number.

It is not a de Polignac number, because 11539397489 - 2¹⁶ = 11539331953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11539391489) 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, 481394 + ... + 504795.

It is an arithmetic number, because the mean of its divisors is an integer number (2885098845).

Almost surely, 2^11539397489 is an apocalyptic number.

It is an amenable number.

11539397489 is a deficient number, since it is larger than the sum of its proper divisors (997891).

11539397489 is an equidigital number, since it uses as much as digits as its factorization.

11539397489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997890.

The product of its digits is 7348320, while the sum is 59.

The spelling of 11539397489 in words is "eleven billion, five hundred thirty-nine million, three hundred ninety-seven thousand, four hundred eighty-nine".