193466981 has 2 divisors, whose sum is σ = 193466982. Its totient is φ = 193466980.

The previous prime is 193466927. The next prime is 193466983. The reversal of 193466981 is 189664391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168766081 + 24700900 = 12991^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 193466981 - 2¹⁰ = 193465957 is a prime.

It is a super-2 number, since 2×193466981² = 74858945474508722, which contains 22 as substring.

Together with 193466983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193466983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96733490 + 96733491.

It is an arithmetic number, because the mean of its divisors is an integer number (96733491).

Almost surely, 2^193466981 is an apocalyptic number.

It is an amenable number.

193466981 is a deficient number, since it is larger than the sum of its proper divisors (1).

193466981 is an equidigital number, since it uses as much as digits as its factorization.

193466981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 193466981 is about 13909.2408491621. The cubic root of 193466981 is about 578.3653746409.

The spelling of 193466981 in words is "one hundred ninety-three million, four hundred sixty-six thousand, nine hundred eighty-one".