194250409 has 2 divisors, whose sum is σ = 194250410. Its totient is φ = 194250408.

The previous prime is 194250403. The next prime is 194250431. The reversal of 194250409 is 904052491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167624809 + 26625600 = 12947^2 + 5160^2 .

It is an emirp because it is prime and its reverse (904052491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194250409 - 2⁵ = 194250377 is a prime.

It is not a weakly prime, because it can be changed into another prime (194250403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97125204 + 97125205.

It is an arithmetic number, because the mean of its divisors is an integer number (97125205).

Almost surely, 2^194250409 is an apocalyptic number.

It is an amenable number.

194250409 is a deficient number, since it is larger than the sum of its proper divisors (1).

194250409 is an equidigital number, since it uses as much as digits as its factorization.

194250409 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 194250409 is about 13937.3745375519. The cubic root of 194250409 is about 579.1450036190.

The spelling of 194250409 in words is "one hundred ninety-four million, two hundred fifty thousand, four hundred nine".