247145 has 4 divisors (see below), whose sum is σ = 296580. Its totient is φ = 197712.

The previous prime is 247141. The next prime is 247183. The reversal of 247145 is 541742.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120409 + 126736 = 347^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 247145 - 2² = 247141 is a prime.

It is a super-2 number, since 2×247145² = 122161302050, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 247145.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24710 + ... + 24719.

It is an arithmetic number, because the mean of its divisors is an integer number (74145).

2²⁴⁷¹⁴⁵ is an apocalyptic number.

It is an amenable number.

247145 is a deficient number, since it is larger than the sum of its proper divisors (49435).

247145 is an equidigital number, since it uses as much as digits as its factorization.

247145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49434.

The product of its digits is 1120, while the sum is 23.

The square root of 247145 is about 497.1368020978. The cubic root of 247145 is about 62.7553288279.

Adding to 247145 its reverse (541742), we get a palindrome (788887).

The spelling of 247145 in words is "two hundred forty-seven thousand, one hundred forty-five".