194237386009 has 2 divisors, whose sum is σ = 194237386010. Its totient is φ = 194237386008.

The previous prime is 194237385977. The next prime is 194237386033. The reversal of 194237386009 is 900683732491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123097827609 + 71139558400 = 350853^2 + 266720^2 .

It is a cyclic number.

It is not a de Polignac number, because 194237386009 - 2⁵ = 194237385977 is a prime.

It is not a weakly prime, because it can be changed into another prime (194237383009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97118693004 + 97118693005.

It is an arithmetic number, because the mean of its divisors is an integer number (97118693005).

Almost surely, 2^194237386009 is an apocalyptic number.

It is an amenable number.

194237386009 is a deficient number, since it is larger than the sum of its proper divisors (1).

194237386009 is an equidigital number, since it uses as much as digits as its factorization.

194237386009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 194237386009 in words is "one hundred ninety-four billion, two hundred thirty-seven million, three hundred eighty-six thousand, nine".