1904555243401 has 2 divisors, whose sum is σ = 1904555243402. Its totient is φ = 1904555243400.

The previous prime is 1904555243387. The next prime is 1904555243447. The reversal of 1904555243401 is 1043425554091.

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., 1648745881225 + 255809362176 = 1284035^2 + 505776^2 .

It is an emirp because it is prime and its reverse (1043425554091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1904555243401 - 2²⁷ = 1904421025673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1904555243471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952277621700 + 952277621701.

It is an arithmetic number, because the mean of its divisors is an integer number (952277621701).

Almost surely, 2^{1904555243401} is an apocalyptic number.

It is an amenable number.

1904555243401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1904555243401 is an equidigital number, since it uses as much as digits as its factorization.

1904555243401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 1904555243401 in words is "one trillion, nine hundred four billion, five hundred fifty-five million, two hundred forty-three thousand, four hundred one".