11617251911281 has 3 divisors (see below), whose sum is σ = 11617255319691. Its totient is φ = 11617248502872.

The previous prime is 11617251911269. The next prime is 11617251911333. The reversal of 11617251911281 is 18211915271611.

The square root of 11617251911281 is 3408409.

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.

It can be written as a sum of positive squares in only one way, i.e., 279216071281 + 11338035840000 = 528409^2 + 3367200^2 .

It is not a de Polignac number, because 11617251911281 - 2¹¹ = 11617251909233 is a prime.

It is a super-2 number, since 2×11617251911281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11617251911201) 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, 1704205 + ... + 5112613.

It is an arithmetic number, because the mean of its divisors is an integer number (3872418439897).

Almost surely, 2^{11617251911281} is an apocalyptic number.

11617251911281 is the 3408409-th square number.

11617251911281 is the 1704205-th centered octagonal number.

It is an amenable number.

11617251911281 is a deficient number, since it is larger than the sum of its proper divisors (3408410).

11617251911281 is an frugal number, since it uses more digits than its factorization.

11617251911281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6816818 (or 3408409 counting only the distinct ones).

The product of its digits is 60480, while the sum is 46.

The spelling of 11617251911281 in words is "eleven trillion, six hundred seventeen billion, two hundred fifty-one million, nine hundred eleven thousand, two hundred eighty-one".