12090077861 has 2 divisors, whose sum is σ = 12090077862. Its totient is φ = 12090077860.

The previous prime is 12090077849. The next prime is 12090077863. The reversal of 12090077861 is 16877009021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8466760225 + 3623317636 = 92015^2 + 60194^2 .

It is an emirp because it is prime and its reverse (16877009021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12090077861 - 2¹⁰ = 12090076837 is a prime.

Together with 12090077863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12090077863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6045038930 + 6045038931.

It is an arithmetic number, because the mean of its divisors is an integer number (6045038931).

Almost surely, 2^12090077861 is an apocalyptic number.

It is an amenable number.

12090077861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12090077861 is an equidigital number, since it uses as much as digits as its factorization.

12090077861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 41.

The spelling of 12090077861 in words is "twelve billion, ninety million, seventy-seven thousand, eight hundred sixty-one".