247713121 has 2 divisors, whose sum is σ = 247713122. Its totient is φ = 247713120.

The previous prime is 247713101. The next prime is 247713133. The reversal of 247713121 is 121317742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229946896 + 17766225 = 15164^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 247713121 - 2⁹ = 247712609 is a prime.

It is a super-2 number, since 2×247713121² = 122723580631121282, which contains 22 as substring.

It is equal to p_13560931 and since 247713121 and 13560931 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 247713121.

It is not a weakly prime, because it can be changed into another prime (247713101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123856560 + 123856561.

It is an arithmetic number, because the mean of its divisors is an integer number (123856561).

Almost surely, 2^247713121 is an apocalyptic number.

It is an amenable number.

247713121 is a deficient number, since it is larger than the sum of its proper divisors (1).

247713121 is an equidigital number, since it uses as much as digits as its factorization.

247713121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 247713121 is about 15738.9046950542. The cubic root of 247713121 is about 628.0337799794.

The spelling of 247713121 in words is "two hundred forty-seven million, seven hundred thirteen thousand, one hundred twenty-one".