11549971373 has 4 divisors (see below), whose sum is σ = 11739315228. Its totient is φ = 11360627520.

The previous prime is 11549971369. The next prime is 11549971399. The reversal of 11549971373 is 37317994511.

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 5220496009 + 6329475364 = 72253^2 + 79558^2 .

It is a cyclic number.

It is not a de Polignac number, because 11549971373 - 2² = 11549971369 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 (11549971273) 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, 94671836 + ... + 94671957.

It is an arithmetic number, because the mean of its divisors is an integer number (2934828807).

Almost surely, 2^11549971373 is an apocalyptic number.

It is an amenable number.

11549971373 is a deficient number, since it is larger than the sum of its proper divisors (189343855).

11549971373 is an equidigital number, since it uses as much as digits as its factorization.

11549971373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189343854.

The product of its digits is 714420, while the sum is 50.

The spelling of 11549971373 in words is "eleven billion, five hundred forty-nine million, nine hundred seventy-one thousand, three hundred seventy-three".