161197447 has 2 divisors, whose sum is σ = 161197448. Its totient is φ = 161197446.

The previous prime is 161197397. The next prime is 161197453. The reversal of 161197447 is 744791161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161197447 - 2¹⁹ = 160673159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161197147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80598723 + 80598724.

It is an arithmetic number, because the mean of its divisors is an integer number (80598724).

Almost surely, 2^161197447 is an apocalyptic number.

161197447 is a deficient number, since it is larger than the sum of its proper divisors (1).

161197447 is an equidigital number, since it uses as much as digits as its factorization.

161197447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 161197447 is about 12696.3556582194. The cubic root of 161197447 is about 544.2344800433.

The spelling of 161197447 in words is "one hundred sixty-one million, one hundred ninety-seven thousand, four hundred forty-seven".