161349779 has 2 divisors, whose sum is σ = 161349780. Its totient is φ = 161349778.

The previous prime is 161349763. The next prime is 161349781. The reversal of 161349779 is 977943161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161349779 - 2⁴ = 161349763 is a prime.

Together with 161349781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161349709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80674889 + 80674890.

It is an arithmetic number, because the mean of its divisors is an integer number (80674890).

Almost surely, 2^161349779 is an apocalyptic number.

161349779 is a deficient number, since it is larger than the sum of its proper divisors (1).

161349779 is an equidigital number, since it uses as much as digits as its factorization.

161349779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 47.

The square root of 161349779 is about 12702.3532859073. The cubic root of 161349779 is about 544.4058603952.

The spelling of 161349779 in words is "one hundred sixty-one million, three hundred forty-nine thousand, seven hundred seventy-nine".