11975421949 has 2 divisors, whose sum is σ = 11975421950. Its totient is φ = 11975421948.

The previous prime is 11975421919. The next prime is 11975421959. The reversal of 11975421949 is 94912457911.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11735388900 + 240033049 = 108330^2 + 15493^2 .

It is an emirp because it is prime and its reverse (94912457911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11975421949 - 2¹¹ = 11975419901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11975421896 and 11975421905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11975421919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5987710974 + 5987710975.

It is an arithmetic number, because the mean of its divisors is an integer number (5987710975).

Almost surely, 2^11975421949 is an apocalyptic number.

It is an amenable number.

11975421949 is a deficient number, since it is larger than the sum of its proper divisors (1).

11975421949 is an equidigital number, since it uses as much as digits as its factorization.

11975421949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The spelling of 11975421949 in words is "eleven billion, nine hundred seventy-five million, four hundred twenty-one thousand, nine hundred forty-nine".