11280981 has 4 divisors (see below), whose sum is σ = 15041312. Its totient is φ = 7520652.

The previous prime is 11280953. The next prime is 11280989. The reversal of 11280981 is 18908211.

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.

It is not a de Polignac number, because 11280981 - 2¹¹ = 11278933 is a prime.

It is a super-2 number, since 2×11280981² = 254521064644722, 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 (11280989) 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, 1880161 + ... + 1880166.

It is an arithmetic number, because the mean of its divisors is an integer number (3760328).

Almost surely, 2^11280981 is an apocalyptic number.

It is an amenable number.

11280981 is a deficient number, since it is larger than the sum of its proper divisors (3760331).

11280981 is an equidigital number, since it uses as much as digits as its factorization.

11280981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760330.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 11280981 is about 3358.7171658239. The cubic root of 11280981 is about 224.2757353243.

The spelling of 11280981 in words is "eleven million, two hundred eighty thousand, nine hundred eighty-one".