193540813 has 2 divisors, whose sum is σ = 193540814. Its totient is φ = 193540812.

The previous prime is 193540771. The next prime is 193540891. The reversal of 193540813 is 318045391.

193540813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141657604 + 51883209 = 11902^2 + 7203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193540813 is a prime.

It is equal to p_10740868 and since 193540813 and 10740868 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193541813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96770406 + 96770407.

It is an arithmetic number, because the mean of its divisors is an integer number (96770407).

Almost surely, 2^193540813 is an apocalyptic number.

It is an amenable number.

193540813 is a deficient number, since it is larger than the sum of its proper divisors (1).

193540813 is an equidigital number, since it uses as much as digits as its factorization.

193540813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 193540813 is about 13911.8946588881. The cubic root of 193540813 is about 578.4389383419.

The spelling of 193540813 in words is "one hundred ninety-three million, five hundred forty thousand, eight hundred thirteen".