194139125556529 has 4 divisors (see below), whose sum is σ = 194139321361776. Its totient is φ = 194138929751284.

The previous prime is 194139125556527. The next prime is 194139125556583. The reversal of 194139125556529 is 925655521931491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 194139125556529 - 2¹ = 194139125556527 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194139125556527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96407779 + ... + 98400904.

It is an arithmetic number, because the mean of its divisors is an integer number (48534830340444).

Almost surely, 2^{194139125556529} is an apocalyptic number.

It is an amenable number.

194139125556529 is a deficient number, since it is larger than the sum of its proper divisors (195805247).

194139125556529 is an equidigital number, since it uses as much as digits as its factorization.

194139125556529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195805246.

The product of its digits is 131220000, while the sum is 67.

The spelling of 194139125556529 in words is "one hundred ninety-four trillion, one hundred thirty-nine billion, one hundred twenty-five million, five hundred fifty-six thousand, five hundred twenty-nine".