247161 has 4 divisors (see below), whose sum is σ = 329552. Its totient is φ = 164772.

The previous prime is 247141. The next prime is 247183. The reversal of 247161 is 161742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 247161 - 2¹⁷ = 116089 is a prime.

It is a super-2 number, since 2×247161² = 122177119842, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 247161.

It is not an unprimeable number, because it can be changed into a prime (247141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41191 + ... + 41196.

It is an arithmetic number, because the mean of its divisors is an integer number (82388).

2²⁴⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

247161 is a deficient number, since it is larger than the sum of its proper divisors (82391).

247161 is an equidigital number, since it uses as much as digits as its factorization.

247161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82390.

The product of its digits is 336, while the sum is 21.

The square root of 247161 is about 497.1528939874. The cubic root of 247161 is about 62.7566830446.

The spelling of 247161 in words is "two hundred forty-seven thousand, one hundred sixty-one".