11981145 has 16 divisors (see below), whose sum is σ = 20912832. Its totient is φ = 5808960.

The previous prime is 11981131. The next prime is 11981161. The reversal of 11981145 is 54118911.

It is a happy number.

It is not a de Polignac number, because 11981145 - 2⁵ = 11981113 is a prime.

It is a super-2 number, since 2×11981145² = 287095671022050, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 36142 + ... + 36471.

It is an arithmetic number, because the mean of its divisors is an integer number (1307052).

Almost surely, 2^11981145 is an apocalyptic number.

11981145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11981145 is a deficient number, since it is larger than the sum of its proper divisors (8931687).

11981145 is a wasteful number, since it uses less digits than its factorization.

11981145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72632.

The product of its digits is 1440, while the sum is 30.

The square root of 11981145 is about 3461.3790604324. The cubic root of 11981145 is about 228.8228768366.

The spelling of 11981145 in words is "eleven million, nine hundred eighty-one thousand, one hundred forty-five".