194026248509 has 2 divisors, whose sum is σ = 194026248510. Its totient is φ = 194026248508.

The previous prime is 194026248469. The next prime is 194026248539. The reversal of 194026248509 is 905842620491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182545126009 + 11481122500 = 427253^2 + 107150^2 .

It is a cyclic number.

It is not a de Polignac number, because 194026248509 - 2²⁰ = 194025199933 is a prime.

It is a super-2 number, since 2×194026248509² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194026248539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97013124254 + 97013124255.

It is an arithmetic number, because the mean of its divisors is an integer number (97013124255).

Almost surely, 2^194026248509 is an apocalyptic number.

It is an amenable number.

194026248509 is a deficient number, since it is larger than the sum of its proper divisors (1).

194026248509 is an equidigital number, since it uses as much as digits as its factorization.

194026248509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 194026248509 in words is "one hundred ninety-four billion, twenty-six million, two hundred forty-eight thousand, five hundred nine".