193691213 has 2 divisors, whose sum is σ = 193691214. Its totient is φ = 193691212.

The previous prime is 193691167. The next prime is 193691233. The reversal of 193691213 is 312196391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162129289 + 31561924 = 12733^2 + 5618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193691213 is a prime.

It is a super-2 number, since 2×193691213² = 75032571986822738, which contains 22 as substring.

It is a Chen prime.

It is equal to p_10748843 and since 193691213 and 10748843 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 (193691233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96845606 + 96845607.

It is an arithmetic number, because the mean of its divisors is an integer number (96845607).

Almost surely, 2^193691213 is an apocalyptic number.

It is an amenable number.

193691213 is a deficient number, since it is larger than the sum of its proper divisors (1).

193691213 is an equidigital number, since it uses as much as digits as its factorization.

193691213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 35.

The square root of 193691213 is about 13917.2990554921. The cubic root of 193691213 is about 578.5887339494.

The spelling of 193691213 in words is "one hundred ninety-three million, six hundred ninety-one thousand, two hundred thirteen".