161947 has 2 divisors, whose sum is σ = 161948. Its totient is φ = 161946.

The previous prime is 161923. The next prime is 161957. The reversal of 161947 is 749161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161947 - 2¹¹ = 159899 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (161957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80973 + 80974.

It is an arithmetic number, because the mean of its divisors is an integer number (80974).

2¹⁶¹⁹⁴⁷ is an apocalyptic number.

161947 is a deficient number, since it is larger than the sum of its proper divisors (1).

161947 is an equidigital number, since it uses as much as digits as its factorization.

161947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 161947 is about 402.4263907847. The cubic root of 161947 is about 54.5076722358.

The spelling of 161947 in words is "one hundred sixty-one thousand, nine hundred forty-seven".