1641193979 has 2 divisors, whose sum is σ = 1641193980. Its totient is φ = 1641193978.

The previous prime is 1641193963. The next prime is 1641193993. The reversal of 1641193979 is 9793911461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1641193979 - 2⁴ = 1641193963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641193999) 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, 820596989 + 820596990.

It is an arithmetic number, because the mean of its divisors is an integer number (820596990).

Almost surely, 2^1641193979 is an apocalyptic number.

1641193979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641193979 is an equidigital number, since it uses as much as digits as its factorization.

1641193979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 50.

The square root of 1641193979 is about 40511.6523854557. The cubic root of 1641193979 is about 1179.5598231328.

The spelling of 1641193979 in words is "one billion, six hundred forty-one million, one hundred ninety-three thousand, nine hundred seventy-nine".