1981211179 has 8 divisors (see below), whose sum is σ = 2019313152. Its totient is φ = 1943136000.

The previous prime is 1981211159. The next prime is 1981211231. The reversal of 1981211179 is 9711121891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981211179 - 2⁹ = 1981210667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981211159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207382 + ... + 216724.

It is an arithmetic number, because the mean of its divisors is an integer number (252414144).

Almost surely, 2^1981211179 is an apocalyptic number.

1981211179 is a deficient number, since it is larger than the sum of its proper divisors (38101973).

1981211179 is an equidigital number, since it uses as much as digits as its factorization.

1981211179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13397.

The product of its digits is 9072, while the sum is 40.

The square root of 1981211179 is about 44510.7984538584. The cubic root of 1981211179 is about 1255.9632249077.

The spelling of 1981211179 in words is "one billion, nine hundred eighty-one million, two hundred eleven thousand, one hundred seventy-nine".