11006881981 has 4 divisors (see below), whose sum is σ = 11007126592. Its totient is φ = 11006637372.

The previous prime is 11006881973. The next prime is 11006882011. The reversal of 11006881981 is 18918860011.

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 11006881981 - 2³ = 11006881973 is a prime.

It is a super-2 number, since 2×11006881981² (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 (11006881961) 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, 33141 + ... + 152026.

It is an arithmetic number, because the mean of its divisors is an integer number (2751781648).

Almost surely, 2^11006881981 is an apocalyptic number.

It is an amenable number.

11006881981 is a deficient number, since it is larger than the sum of its proper divisors (244611).

11006881981 is an equidigital number, since it uses as much as digits as its factorization.

11006881981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244610.

The product of its (nonzero) digits is 27648, while the sum is 43.

The spelling of 11006881981 in words is "eleven billion, six million, eight hundred eighty-one thousand, nine hundred eighty-one".