11831779019 has 4 divisors (see below), whose sum is σ = 11837845440. Its totient is φ = 11825712600.

The previous prime is 11831778977. The next prime is 11831779033. The reversal of 11831779019 is 91097713811.

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

It is a cyclic number.

It is not a de Polignac number, because 11831779019 - 2¹² = 11831774923 is a prime.

It is a super-2 number, since 2×11831779019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11831779319) 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, 3030284 + ... + 3034185.

It is an arithmetic number, because the mean of its divisors is an integer number (2959461360).

Almost surely, 2^11831779019 is an apocalyptic number.

11831779019 is a deficient number, since it is larger than the sum of its proper divisors (6066421).

11831779019 is an equidigital number, since it uses as much as digits as its factorization.

11831779019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6066420.

The product of its (nonzero) digits is 95256, while the sum is 47.

The spelling of 11831779019 in words is "eleven billion, eight hundred thirty-one million, seven hundred seventy-nine thousand, nineteen".