11741831581 has 4 divisors (see below), whose sum is σ = 11745173692. Its totient is φ = 11738489472.

The previous prime is 11741831579. The next prime is 11741831669. The reversal of 11741831581 is 18513814711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18513814711 = 7 ⋅2644830673.

It can be written as a sum of positive squares in 2 ways, for example, as 5250306681 + 6491524900 = 72459^2 + 80570^2 .

It is a cyclic number.

It is not a de Polignac number, because 11741831581 - 2¹ = 11741831579 is a prime.

It is a super-2 number, since 2×11741831581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11741831551) 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, 1665780 + ... + 1672813.

It is an arithmetic number, because the mean of its divisors is an integer number (2936293423).

Almost surely, 2^11741831581 is an apocalyptic number.

It is an amenable number.

11741831581 is a deficient number, since it is larger than the sum of its proper divisors (3342111).

11741831581 is an equidigital number, since it uses as much as digits as its factorization.

11741831581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342110.

The product of its digits is 26880, while the sum is 40.

The spelling of 11741831581 in words is "eleven billion, seven hundred forty-one million, eight hundred thirty-one thousand, five hundred eighty-one".