11988130981 has 2 divisors, whose sum is σ = 11988130982. Its totient is φ = 11988130980.

The previous prime is 11988130967. The next prime is 11988131053. The reversal of 11988130981 is 18903188911.

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., 7354606081 + 4633524900 = 85759^2 + 68070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11988130981 is a prime.

It is a super-2 number, since 2×11988130981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11988130901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994065490 + 5994065491.

It is an arithmetic number, because the mean of its divisors is an integer number (5994065491).

Almost surely, 2^11988130981 is an apocalyptic number.

It is an amenable number.

11988130981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11988130981 is an equidigital number, since it uses as much as digits as its factorization.

11988130981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 49.

The spelling of 11988130981 in words is "eleven billion, nine hundred eighty-eight million, one hundred thirty thousand, nine hundred eighty-one".