11439853781 has 4 divisors (see below), whose sum is σ = 11937238752. Its totient is φ = 10942468812.

The previous prime is 11439853717. The next prime is 11439853801. The reversal of 11439853781 is 18735893411.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11439853781 - 2⁶ = 11439853717 is a prime.

It is a super-2 number, since 2×11439853781² (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 (11439853081) 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, 248692451 + ... + 248692496.

It is an arithmetic number, because the mean of its divisors is an integer number (2984309688).

Almost surely, 2^11439853781 is an apocalyptic number.

It is an amenable number.

11439853781 is a deficient number, since it is larger than the sum of its proper divisors (497384971).

11439853781 is an equidigital number, since it uses as much as digits as its factorization.

11439853781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497384970.

The product of its digits is 725760, while the sum is 50.

The spelling of 11439853781 in words is "eleven billion, four hundred thirty-nine million, eight hundred fifty-three thousand, seven hundred eighty-one".