102194381 has 2 divisors, whose sum is σ = 102194382. Its totient is φ = 102194380.

The previous prime is 102194353. The next prime is 102194419. The reversal of 102194381 is 183491201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102191881 + 2500 = 10109^2 + 50^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102194381 is a prime.

It is a super-2 number, since 2×102194381² = 20887383015946322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102194881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51097190 + 51097191.

It is an arithmetic number, because the mean of its divisors is an integer number (51097191).

Almost surely, 2^102194381 is an apocalyptic number.

It is an amenable number.

102194381 is a deficient number, since it is larger than the sum of its proper divisors (1).

102194381 is an equidigital number, since it uses as much as digits as its factorization.

102194381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 102194381 is about 10109.1236514349. The cubic root of 102194381 is about 467.5294857817.

The spelling of 102194381 in words is "one hundred two million, one hundred ninety-four thousand, three hundred eighty-one".