161241791 has 2 divisors, whose sum is σ = 161241792. Its totient is φ = 161241790.

The previous prime is 161241763. The next prime is 161241793. The reversal of 161241791 is 197142161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161241791 is a prime.

Together with 161241793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161241793) 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, 80620895 + 80620896.

It is an arithmetic number, because the mean of its divisors is an integer number (80620896).

Almost surely, 2^161241791 is an apocalyptic number.

161241791 is a deficient number, since it is larger than the sum of its proper divisors (1).

161241791 is an equidigital number, since it uses as much as digits as its factorization.

161241791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 161241791 is about 12698.1018660271. The cubic root of 161241791 is about 544.2843801743.

The spelling of 161241791 in words is "one hundred sixty-one million, two hundred forty-one thousand, seven hundred ninety-one".