11627981 has 4 divisors (see below), whose sum is σ = 12240000. Its totient is φ = 11015964.

The previous prime is 11627963. The next prime is 11627989. The reversal of 11627981 is 18972611.

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: 18972611 = 7 ⋅2710373.

It is a cyclic number.

It is not a de Polignac number, because 11627981 - 2¹⁰ = 11626957 is a prime.

It is a super-2 number, since 2×11627981² = 270419884272722, 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 (11627989) 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, 305981 + ... + 306018.

It is an arithmetic number, because the mean of its divisors is an integer number (3060000).

Almost surely, 2^11627981 is an apocalyptic number.

It is an amenable number.

11627981 is a deficient number, since it is larger than the sum of its proper divisors (612019).

11627981 is an equidigital number, since it uses as much as digits as its factorization.

11627981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612018.

The product of its digits is 6048, while the sum is 35.

The square root of 11627981 is about 3409.9825512750. The cubic root of 11627981 is about 226.5521064213.

The spelling of 11627981 in words is "eleven million, six hundred twenty-seven thousand, nine hundred eighty-one".