194698915009 has 3 divisors (see below), whose sum is σ = 194699356257. Its totient is φ = 194698473762.

The previous prime is 194698915007. The next prime is 194698915027. The reversal of 194698915009 is 900519896491.

The square root of 194698915009 is 441247.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 900519896491 = 4391 ⋅205083101.

It is not a de Polignac number, because 194698915009 - 2¹ = 194698915007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194698915007) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 220624 + ... + 661870.

It is an arithmetic number, because the mean of its divisors is an integer number (64899785419).

Almost surely, 2^194698915009 is an apocalyptic number.

194698915009 is the 441247-th square number.

194698915009 is the 220624-th centered octagonal number.

It is an amenable number.

194698915009 is a deficient number, since it is larger than the sum of its proper divisors (441248).

194698915009 is an frugal number, since it uses more digits than its factorization.

194698915009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882494 (or 441247 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 61.

The spelling of 194698915009 in words is "one hundred ninety-four billion, six hundred ninety-eight million, nine hundred fifteen thousand, nine".