194144221939 has 2 divisors, whose sum is σ = 194144221940. Its totient is φ = 194144221938.

The previous prime is 194144221883. The next prime is 194144221949. The reversal of 194144221939 is 939122441491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194144221939 - 2¹⁵ = 194144189171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 194144221892 and 194144221901.

It is not a weakly prime, because it can be changed into another prime (194144221949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97072110969 + 97072110970.

It is an arithmetic number, because the mean of its divisors is an integer number (97072110970).

Almost surely, 2^194144221939 is an apocalyptic number.

194144221939 is a deficient number, since it is larger than the sum of its proper divisors (1).

194144221939 is an equidigital number, since it uses as much as digits as its factorization.

194144221939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The spelling of 194144221939 in words is "one hundred ninety-four billion, one hundred forty-four million, two hundred twenty-one thousand, nine hundred thirty-nine".