11136981 has 4 divisors (see below), whose sum is σ = 14849312. Its totient is φ = 7424652.

The previous prime is 11136977. The next prime is 11136997. The reversal of 11136981 is 18963111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18963111 = 3 ⋅6321037.

It is not a de Polignac number, because 11136981 - 2² = 11136977 is a prime.

It is a super-2 number, since 2×11136981² = 248064691588722, 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 (11136901) 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, 1856161 + ... + 1856166.

It is an arithmetic number, because the mean of its divisors is an integer number (3712328).

Almost surely, 2^11136981 is an apocalyptic number.

It is an amenable number.

11136981 is a deficient number, since it is larger than the sum of its proper divisors (3712331).

11136981 is an equidigital number, since it uses as much as digits as its factorization.

11136981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712330.

The product of its digits is 1296, while the sum is 30.

The square root of 11136981 is about 3337.2115605697. The cubic root of 11136981 is about 223.3173640224.

The spelling of 11136981 in words is "eleven million, one hundred thirty-six thousand, nine hundred eighty-one".