11271219557 has 4 divisors (see below), whose sum is σ = 12138236460. Its totient is φ = 10404202656.

The previous prime is 11271219523. The next prime is 11271219559. The reversal of 11271219557 is 75591217211.

It is a Cunningham number, because it is equal to 106166²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1667415556 + 9603804001 = 40834^2 + 97999^2 .

It is a cyclic number.

It is not a de Polignac number, because 11271219557 - 2¹⁰ = 11271218533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11271219559) 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, 433508432 + ... + 433508457.

It is an arithmetic number, because the mean of its divisors is an integer number (3034559115).

Almost surely, 2^11271219557 is an apocalyptic number.

It is an amenable number.

11271219557 is a deficient number, since it is larger than the sum of its proper divisors (867016903).

11271219557 is an equidigital number, since it uses as much as digits as its factorization.

11271219557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867016902.

The product of its digits is 44100, while the sum is 41.

The spelling of 11271219557 in words is "eleven billion, two hundred seventy-one million, two hundred nineteen thousand, five hundred fifty-seven".