194976979 has 2 divisors, whose sum is σ = 194976980. Its totient is φ = 194976978.

The previous prime is 194976937. The next prime is 194976997. The reversal of 194976979 is 979679491.

Together with next prime (194976997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194976979 - 2¹¹ = 194974931 is a prime.

It is not a weakly prime, because it can be changed into another prime (194976919) 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, 97488489 + 97488490.

It is an arithmetic number, because the mean of its divisors is an integer number (97488490).

Almost surely, 2^194976979 is an apocalyptic number.

194976979 is a deficient number, since it is larger than the sum of its proper divisors (1).

194976979 is an equidigital number, since it uses as much as digits as its factorization.

194976979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7715736, while the sum is 61.

The square root of 194976979 is about 13963.4157354137. The cubic root of 194976979 is about 579.8661789956.

The spelling of 194976979 in words is "one hundred ninety-four million, nine hundred seventy-six thousand, nine hundred seventy-nine".