193439909561 has 16 divisors (see below), whose sum is σ = 202423415040. Its totient is φ = 184621731840.

The previous prime is 193439909557. The next prime is 193439909563. The reversal of 193439909561 is 165909934391.

It is a cyclic number.

It is not a de Polignac number, because 193439909561 - 2² = 193439909557 is a prime.

It is a super-2 number, since 2×193439909561² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 193439909561.

It is not an unprimeable number, because it can be changed into a prime (193439909563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 877280 + ... + 1075406.

It is an arithmetic number, because the mean of its divisors is an integer number (12651463440).

Almost surely, 2^193439909561 is an apocalyptic number.

It is an amenable number.

193439909561 is a deficient number, since it is larger than the sum of its proper divisors (8983505479).

193439909561 is a wasteful number, since it uses less digits than its factorization.

193439909561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198544.

The product of its (nonzero) digits is 7085880, while the sum is 59.

The spelling of 193439909561 in words is "one hundred ninety-three billion, four hundred thirty-nine million, nine hundred nine thousand, five hundred sixty-one".