11380981 has 4 divisors (see below), whose sum is σ = 11980000. Its totient is φ = 10781964.

The previous prime is 11380979. The next prime is 11381011. The reversal of 11380981 is 18908311.

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: 18908311 = 101 ⋅187211.

It is a cyclic number.

It is not a de Polignac number, because 11380981 - 2¹ = 11380979 is a prime.

It is a super-2 number, since 2×11380981² = 259053457044722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11380921) 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, 299481 + ... + 299518.

It is an arithmetic number, because the mean of its divisors is an integer number (2995000).

Almost surely, 2^11380981 is an apocalyptic number.

It is an amenable number.

11380981 is a deficient number, since it is larger than the sum of its proper divisors (599019).

11380981 is an equidigital number, since it uses as much as digits as its factorization.

11380981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599018.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 11380981 is about 3373.5709567163. The cubic root of 11380981 is about 224.9364824822.

The spelling of 11380981 in words is "eleven million, three hundred eighty thousand, nine hundred eighty-one".