11724340381 has 4 divisors (see below), whose sum is σ = 12626212732. Its totient is φ = 10822468032.

The previous prime is 11724340363. The next prime is 11724340387. The reversal of 11724340381 is 18304342711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18304342711 = 36809 ⋅497279.

It can be written as a sum of positive squares in 2 ways, for example, as 7087956100 + 4636384281 = 84190^2 + 68091^2 .

It is a cyclic number.

It is not a de Polignac number, because 11724340381 - 2⁵ = 11724340349 is a prime.

It is a super-2 number, since 2×11724340381² (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 (11724340387) 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, 450936156 + ... + 450936181.

It is an arithmetic number, because the mean of its divisors is an integer number (3156553183).

Almost surely, 2^11724340381 is an apocalyptic number.

It is an amenable number.

11724340381 is a deficient number, since it is larger than the sum of its proper divisors (901872351).

11724340381 is an equidigital number, since it uses as much as digits as its factorization.

11724340381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901872350.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 11724340381 in words is "eleven billion, seven hundred twenty-four million, three hundred forty thousand, three hundred eighty-one".