247752221 has 2 divisors, whose sum is σ = 247752222. Its totient is φ = 247752220.

The previous prime is 247752209. The next prime is 247752233. The reversal of 247752221 is 122257742.

247752221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (247752209) and next prime (247752233).

It can be written as a sum of positive squares in only one way, i.e., 247716121 + 36100 = 15739^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 247752221 - 2¹⁰ = 247751197 is a prime.

It is a super-2 number, since 2×247752221² = 122762326020865682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247752121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123876110 + 123876111.

It is an arithmetic number, because the mean of its divisors is an integer number (123876111).

Almost surely, 2^247752221 is an apocalyptic number.

It is an amenable number.

247752221 is a deficient number, since it is larger than the sum of its proper divisors (1).

247752221 is an equidigital number, since it uses as much as digits as its factorization.

247752221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 32.

The square root of 247752221 is about 15740.1467909292. The cubic root of 247752221 is about 628.0668220037.

The spelling of 247752221 in words is "two hundred forty-seven million, seven hundred fifty-two thousand, two hundred twenty-one".