19456121 has 2 divisors, whose sum is σ = 19456122. Its totient is φ = 19456120.

The previous prime is 19456103. The next prime is 19456139. The reversal of 19456121 is 12165491.

It is a balanced prime because it is at equal distance from previous prime (19456103) and next prime (19456139).

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 2768896 = 4085^2 + 1664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19456121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19456421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9728060 + 9728061.

It is an arithmetic number, because the mean of its divisors is an integer number (9728061).

Almost surely, 2^19456121 is an apocalyptic number.

It is an amenable number.

19456121 is a deficient number, since it is larger than the sum of its proper divisors (1).

19456121 is an equidigital number, since it uses as much as digits as its factorization.

19456121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 19456121 is about 4410.9093166829. The cubic root of 19456121 is about 268.9585901072.

The spelling of 19456121 in words is "nineteen million, four hundred fifty-six thousand, one hundred twenty-one".