194641261 has 2 divisors, whose sum is σ = 194641262. Its totient is φ = 194641260.

The previous prime is 194641259. The next prime is 194641273. The reversal of 194641261 is 162146491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188540361 + 6100900 = 13731^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 194641261 - 2¹ = 194641259 is a prime.

Together with 194641259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194641661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97320630 + 97320631.

It is an arithmetic number, because the mean of its divisors is an integer number (97320631).

Almost surely, 2^194641261 is an apocalyptic number.

It is an amenable number.

194641261 is a deficient number, since it is larger than the sum of its proper divisors (1).

194641261 is an equidigital number, since it uses as much as digits as its factorization.

194641261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 194641261 is about 13951.3892139815. The cubic root of 194641261 is about 579.5331766884.

The spelling of 194641261 in words is "one hundred ninety-four million, six hundred forty-one thousand, two hundred sixty-one".