161442247 has 2 divisors, whose sum is σ = 161442248. Its totient is φ = 161442246.

The previous prime is 161442191. The next prime is 161442299. The reversal of 161442247 is 742244161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161442247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161442847) 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, 80721123 + 80721124.

It is an arithmetic number, because the mean of its divisors is an integer number (80721124).

Almost surely, 2^161442247 is an apocalyptic number.

161442247 is a deficient number, since it is larger than the sum of its proper divisors (1).

161442247 is an equidigital number, since it uses as much as digits as its factorization.

161442247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 31.

The square root of 161442247 is about 12705.9925625667. The cubic root of 161442247 is about 544.5098384484.

The spelling of 161442247 in words is "one hundred sixty-one million, four hundred forty-two thousand, two hundred forty-seven".