161995447 has 2 divisors, whose sum is σ = 161995448. Its totient is φ = 161995446.

The previous prime is 161995441. The next prime is 161995459. The reversal of 161995447 is 744599161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161995447 - 2¹⁵ = 161962679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161995397 and 161995406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161995441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80997723 + 80997724.

It is an arithmetic number, because the mean of its divisors is an integer number (80997724).

Almost surely, 2^161995447 is an apocalyptic number.

161995447 is a deficient number, since it is larger than the sum of its proper divisors (1).

161995447 is an equidigital number, since it uses as much as digits as its factorization.

161995447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 161995447 is about 12727.7432013692. The cubic root of 161995447 is about 545.1310707956.

The spelling of 161995447 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, four hundred forty-seven".