194428538519 has 2 divisors, whose sum is σ = 194428538520. Its totient is φ = 194428538518.

The previous prime is 194428538503. The next prime is 194428538567. The reversal of 194428538519 is 915835824491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194428538519 - 2⁴ = 194428538503 is a prime.

It is a super-2 number, since 2×194428538519² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194428538719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97214269259 + 97214269260.

It is an arithmetic number, because the mean of its divisors is an integer number (97214269260).

Almost surely, 2^194428538519 is an apocalyptic number.

194428538519 is a deficient number, since it is larger than the sum of its proper divisors (1).

194428538519 is an equidigital number, since it uses as much as digits as its factorization.

194428538519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12441600, while the sum is 59.

The spelling of 194428538519 in words is "one hundred ninety-four billion, four hundred twenty-eight million, five hundred thirty-eight thousand, five hundred nineteen".