194497205879 has 2 divisors, whose sum is σ = 194497205880. Its totient is φ = 194497205878.

The previous prime is 194497205869. The next prime is 194497205897. The reversal of 194497205879 is 978502794491.

Together with next prime (194497205897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194497205879 - 2⁴ = 194497205863 is a prime.

It is a super-2 number, since 2×194497205879² (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 (194497205869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97248602939 + 97248602940.

It is an arithmetic number, because the mean of its divisors is an integer number (97248602940).

Almost surely, 2^194497205879 is an apocalyptic number.

194497205879 is a deficient number, since it is larger than the sum of its proper divisors (1).

194497205879 is an equidigital number, since it uses as much as digits as its factorization.

194497205879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 65.

The spelling of 194497205879 in words is "one hundred ninety-four billion, four hundred ninety-seven million, two hundred five thousand, eight hundred seventy-nine".