247794121 has 2 divisors, whose sum is σ = 247794122. Its totient is φ = 247794120.

The previous prime is 247794077. The next prime is 247794137. The reversal of 247794121 is 121497742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237160000 + 10634121 = 15400^2 + 3261^2 .

It is a cyclic number.

It is not a de Polignac number, because 247794121 - 2¹⁷ = 247663049 is a prime.

It is a super-2 number, since 2×247794121² = 122803852804325282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247794161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123897060 + 123897061.

It is an arithmetic number, because the mean of its divisors is an integer number (123897061).

Almost surely, 2^247794121 is an apocalyptic number.

It is an amenable number.

247794121 is a deficient number, since it is larger than the sum of its proper divisors (1).

247794121 is an equidigital number, since it uses as much as digits as its factorization.

247794121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 247794121 is about 15741.4777260586. The cubic root of 247794121 is about 628.1022263502.

It can be divided in two parts, 24779 and 4121, that added together give a square (28900 = 170²).

The spelling of 247794121 in words is "two hundred forty-seven million, seven hundred ninety-four thousand, one hundred twenty-one".