161311747 has 2 divisors, whose sum is σ = 161311748. Its totient is φ = 161311746.

The previous prime is 161311739. The next prime is 161311751. The reversal of 161311747 is 747113161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161311747 - 2³ = 161311739 is a prime.

It is not a weakly prime, because it can be changed into another prime (161311727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80655873 + 80655874.

It is an arithmetic number, because the mean of its divisors is an integer number (80655874).

Almost surely, 2^161311747 is an apocalyptic number.

161311747 is a deficient number, since it is larger than the sum of its proper divisors (1).

161311747 is an equidigital number, since it uses as much as digits as its factorization.

161311747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 161311747 is about 12700.8561522442. The cubic root of 161311747 is about 544.3630827916.

The spelling of 161311747 in words is "one hundred sixty-one million, three hundred eleven thousand, seven hundred forty-seven".