11378981 has 4 divisors (see below), whose sum is σ = 11455500. Its totient is φ = 11302464.

The previous prime is 11378977. The next prime is 11378989. The reversal of 11378981 is 18987311.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2076481 + 9302500 = 1441^2 + 3050^2 .

It is a cyclic number.

It is not a de Polignac number, because 11378981 - 2² = 11378977 is a prime.

It is a super-2 number, since 2×11378981² = 258962417196722, which 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 (11378989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38036 + ... + 38333.

It is an arithmetic number, because the mean of its divisors is an integer number (2863875).

Almost surely, 2^11378981 is an apocalyptic number.

It is an amenable number.

11378981 is a deficient number, since it is larger than the sum of its proper divisors (76519).

11378981 is an equidigital number, since it uses as much as digits as its factorization.

11378981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76518.

The product of its digits is 12096, while the sum is 38.

The square root of 11378981 is about 3373.2745218852. The cubic root of 11378981 is about 224.9233055478.

The spelling of 11378981 in words is "eleven million, three hundred seventy-eight thousand, nine hundred eighty-one".