193689913 has 2 divisors, whose sum is σ = 193689914. Its totient is φ = 193689912.

The previous prime is 193689911. The next prime is 193689941. The reversal of 193689913 is 319986391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131721529 + 61968384 = 11477^2 + 7872^2 .

It is a cyclic number.

It is not a de Polignac number, because 193689913 - 2¹ = 193689911 is a prime.

Together with 193689911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (193689911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96844956 + 96844957.

It is an arithmetic number, because the mean of its divisors is an integer number (96844957).

Almost surely, 2^193689913 is an apocalyptic number.

It is an amenable number.

193689913 is a deficient number, since it is larger than the sum of its proper divisors (1).

193689913 is an equidigital number, since it uses as much as digits as its factorization.

193689913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 49.

The square root of 193689913 is about 13917.2523509492. The cubic root of 193689913 is about 578.5874395058.

The spelling of 193689913 in words is "one hundred ninety-three million, six hundred eighty-nine thousand, nine hundred thirteen".