11989881427 has 2 divisors, whose sum is σ = 11989881428. Its totient is φ = 11989881426.

The previous prime is 11989881361. The next prime is 11989881437. The reversal of 11989881427 is 72418898911.

It is a strong prime.

It is an emirp because it is prime and its reverse (72418898911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11989881427 - 2¹⁵ = 11989848659 is a prime.

It is not a weakly prime, because it can be changed into another prime (11989881437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994940713 + 5994940714.

It is an arithmetic number, because the mean of its divisors is an integer number (5994940714).

Almost surely, 2^11989881427 is an apocalyptic number.

11989881427 is a deficient number, since it is larger than the sum of its proper divisors (1).

11989881427 is an equidigital number, since it uses as much as digits as its factorization.

11989881427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 58.

The spelling of 11989881427 in words is "eleven billion, nine hundred eighty-nine million, eight hundred eighty-one thousand, four hundred twenty-seven".