11832545981 has 2 divisors, whose sum is σ = 11832545982. Its totient is φ = 11832545980.

The previous prime is 11832545971. The next prime is 11832546031. The reversal of 11832545981 is 18954523811.

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., 7258188025 + 4574357956 = 85195^2 + 67634^2 .

It is a cyclic number.

It is not a de Polignac number, because 11832545981 - 2¹⁰ = 11832544957 is a prime.

It is a super-2 number, since 2×11832545981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11832545951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5916272990 + 5916272991.

It is an arithmetic number, because the mean of its divisors is an integer number (5916272991).

Almost surely, 2^11832545981 is an apocalyptic number.

It is an amenable number.

11832545981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11832545981 is an equidigital number, since it uses as much as digits as its factorization.

11832545981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 47.

The spelling of 11832545981 in words is "eleven billion, eight hundred thirty-two million, five hundred forty-five thousand, nine hundred eighty-one".