194132381 has 2 divisors, whose sum is σ = 194132382. Its totient is φ = 194132380.

The previous prime is 194132369. The next prime is 194132399. The reversal of 194132381 is 183231491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167702500 + 26429881 = 12950^2 + 5141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194132381 is a prime.

It is a super-2 number, since 2×194132381² = 75374762705458322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194132321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97066190 + 97066191.

It is an arithmetic number, because the mean of its divisors is an integer number (97066191).

Almost surely, 2^194132381 is an apocalyptic number.

It is an amenable number.

194132381 is a deficient number, since it is larger than the sum of its proper divisors (1).

194132381 is an equidigital number, since it uses as much as digits as its factorization.

194132381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 194132381 is about 13933.1396677131. The cubic root of 194132381 is about 579.0276822434.

The spelling of 194132381 in words is "one hundred ninety-four million, one hundred thirty-two thousand, three hundred eighty-one".