11381989 has 2 divisors, whose sum is σ = 11381990. Its totient is φ = 11381988.

The previous prime is 11381983. The next prime is 11382011. The reversal of 11381989 is 98918311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9351364 + 2030625 = 3058^2 + 1425^2 .

It is a cyclic number.

It is not a de Polignac number, because 11381989 - 2⁷ = 11381861 is a prime.

It is a super-2 number, since 2×11381989² = 259099347192242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11381983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5690994 + 5690995.

It is an arithmetic number, because the mean of its divisors is an integer number (5690995).

Almost surely, 2^11381989 is an apocalyptic number.

It is an amenable number.

11381989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11381989 is an equidigital number, since it uses as much as digits as its factorization.

11381989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 40.

The square root of 11381989 is about 3373.7203499994. The cubic root of 11381989 is about 224.9431230721.

The spelling of 11381989 in words is "eleven million, three hundred eighty-one thousand, nine hundred eighty-nine".