247228381 has 2 divisors, whose sum is σ = 247228382. Its totient is φ = 247228380.

The previous prime is 247228369. The next prime is 247228391. The reversal of 247228381 is 183822742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245705625 + 1522756 = 15675^2 + 1234^2 .

It is a cyclic number.

It is not a de Polignac number, because 247228381 - 2⁷ = 247228253 is a prime.

It is a super-3 number, since 3×247228381³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 247228381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247228301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123614190 + 123614191.

It is an arithmetic number, because the mean of its divisors is an integer number (123614191).

Almost surely, 2^247228381 is an apocalyptic number.

It is an amenable number.

247228381 is a deficient number, since it is larger than the sum of its proper divisors (1).

247228381 is an equidigital number, since it uses as much as digits as its factorization.

247228381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 247228381 is about 15723.4977342829. The cubic root of 247228381 is about 627.6238543268.

The spelling of 247228381 in words is "two hundred forty-seven million, two hundred twenty-eight thousand, three hundred eighty-one".