193978969 has 2 divisors, whose sum is σ = 193978970. Its totient is φ = 193978968.

The previous prime is 193978949. The next prime is 193979021. The reversal of 193978969 is 969879391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168091225 + 25887744 = 12965^2 + 5088^2 .

It is a cyclic number.

It is not a de Polignac number, because 193978969 - 2⁵ = 193978937 is a prime.

It is a super-2 number, since 2×193978969² = 75255680828605922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (193978919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96989484 + 96989485.

It is an arithmetic number, because the mean of its divisors is an integer number (96989485).

Almost surely, 2^193978969 is an apocalyptic number.

It is an amenable number.

193978969 is a deficient number, since it is larger than the sum of its proper divisors (1).

193978969 is an equidigital number, since it uses as much as digits as its factorization.

193978969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6613488, while the sum is 61.

The square root of 193978969 is about 13927.6332878203. The cubic root of 193978969 is about 578.8751176143.

It can be divided in two parts, 1939 and 78969, that added together give a palindrome (80908).

The spelling of 193978969 in words is "one hundred ninety-three million, nine hundred seventy-eight thousand, nine hundred sixty-nine".