194406253 has 2 divisors, whose sum is σ = 194406254. Its totient is φ = 194406252.

The previous prime is 194406221. The next prime is 194406259. The reversal of 194406253 is 352604491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180552969 + 13853284 = 13437^2 + 3722^2 .

It is a cyclic number.

It is not a de Polignac number, because 194406253 - 2⁵ = 194406221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194406259) 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, 97203126 + 97203127.

It is an arithmetic number, because the mean of its divisors is an integer number (97203127).

Almost surely, 2^194406253 is an apocalyptic number.

It is an amenable number.

194406253 is a deficient number, since it is larger than the sum of its proper divisors (1).

194406253 is an equidigital number, since it uses as much as digits as its factorization.

194406253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 194406253 is about 13942.9642831071. The cubic root of 194406253 is about 579.2998418132.

The spelling of 194406253 in words is "one hundred ninety-four million, four hundred six thousand, two hundred fifty-three".