11797239653521 has 27 divisors (see below), whose sum is σ = 14051119953033. Its totient is φ = 9875893232520.

The previous prime is 11797239653519. The next prime is 11797239653609. The reversal of 11797239653521 is 12535693279711.

The square root of 11797239653521 is 3434711.

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

It is not a de Polignac number, because 11797239653521 - 2¹ = 11797239653519 is a prime.

It is a super-3 number, since 3×11797239653521³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11797239653521.

It is not an unprimeable number, because it can be changed into a prime (11797239653821) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1033842306 + ... + 1033853716.

Almost surely, 2^{11797239653521} is an apocalyptic number.

11797239653521 is the 3434711-st square number.

11797239653521 is the 1717356-th centered octagonal number.

It is an amenable number.

11797239653521 is a deficient number, since it is larger than the sum of its proper divisors (2253880299512).

11797239653521 is an frugal number, since it uses more digits than its factorization.

11797239653521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22922 (or 11461 counting only the distinct ones).

The product of its digits is 21432600, while the sum is 61.

The spelling of 11797239653521 in words is "eleven trillion, seven hundred ninety-seven billion, two hundred thirty-nine million, six hundred fifty-three thousand, five hundred twenty-one".