11981013 has 8 divisors (see below), whose sum is σ = 17426976. Its totient is φ = 7261200.

The previous prime is 11981009. The next prime is 11981017. The reversal of 11981013 is 31018911.

It is an interprime number because it is at equal distance from previous prime (11981009) and next prime (11981017).

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

It is not a de Polignac number, because 11981013 - 2² = 11981009 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181498 + ... + 181563.

It is an arithmetic number, because the mean of its divisors is an integer number (2178372).

Almost surely, 2^11981013 is an apocalyptic number.

It is an amenable number.

11981013 is a deficient number, since it is larger than the sum of its proper divisors (5445963).

11981013 is a wasteful number, since it uses less digits than its factorization.

11981013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363075.

The product of its (nonzero) digits is 216, while the sum is 24.

The square root of 11981013 is about 3461.3599928352. The cubic root of 11981013 is about 228.8220364960.

Adding to 11981013 its reverse (31018911), we get a palindrome (42999924).

It can be divided in two parts, 1198 and 1013, that added together give a triangular number (2211 = T₆₆).

The spelling of 11981013 in words is "eleven million, nine hundred eighty-one thousand, thirteen".