11475981 has 24 divisors (see below), whose sum is σ = 19038240. Its totient is φ = 6588000.

The previous prime is 11475977. The next prime is 11476001. The reversal of 11475981 is 18957411.

11475981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11475981 - 2² = 11475977 is a prime.

It is a super-2 number, since 2×11475981² = 263396279824722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11475911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1170 + ... + 4931.

It is an arithmetic number, because the mean of its divisors is an integer number (793260).

Almost surely, 2^11475981 is an apocalyptic number.

11475981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11475981 is a deficient number, since it is larger than the sum of its proper divisors (7562259).

11475981 is a wasteful number, since it uses less digits than its factorization.

11475981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6137 (or 6134 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 11475981 is about 3387.6217321301. The cubic root of 11475981 is about 225.5606168049.

The spelling of 11475981 in words is "eleven million, four hundred seventy-five thousand, nine hundred eighty-one".